This is in half to avoid people getting Bear Clawed for necroing, and half because I am finally addressing and in therapy for my PTSD, anxiety, and depression issues, and I'm looking for inspiration to resume this.
To folks who read this in full: What did you like, and what could use improvement?
I have liked pretty much of all of it, but I think if you follow OTL history you will have a few problems crop up - the banning of active suspension and ABS will still make 1994 a rough season (maybe keep ABS, under the theory that it allows drivers to lean harder on their cars), and Chrysler's funds made Lamborghini's F1 program possible, and when they sell it the company is gonna have a hard time maintaining the funds for it. (Maybe the successful Lamborghini F1 project and Chrysler's growing 1990s profile makes them want to keep Lamborghini and Maserati rather than sell them off, and Lamborghini design input improves subsequent Chrysler products?)
To all: This is an IndyCar/F1 story, and I grew up as a Senna/Unser Jr. fanboy. Those two drivers will lose in the future, but they won't get screwed hard or injured critically/fatally. Between Senna dying and Little Al turning to the bottle after his daughter's paralysis, I am NOT going to hurt my heroes from OTL. If TTL can be revived and kept going long enough, they will face the demons of age and what to do as their windows close, but they aren't getting killed off or even Wickens'd.
That said, I'm looking for ideas, insights, and inspiration, there won't be a reboot, but if I can keep on the upward track of mental health, this story is coming back this year.
Firstly, make sure your mental health improves. We can all wait, you getting yourself better is most important.
As far as ideas and inspiration, I always what could have been if Tony George had used his (massive) financial resources and enthusiasm to build up CART as a partnership between the team owners (though CART) and Indianapolis and other track owners and commercial parties. Tony George had enthusiasm and connections, and he would later be a team owner in the IRL (and is the godson of AJ Foyt, who was and is a team owner), and if you make him dump his money in IRL-size quantities into the sport, providing for the best to move up (you're already doing that ITTL and it's awesome, but it can go much, much further), he'll end up if not running CART from its executive offices, then running it through his connections to the other owners.
CART didn't have tracks like Walt Disney World or Las Vegas on their radar, despite the commercial possibilities they provide. Make those two in particular succeed, and your possibilities are considerable. (A Disney-Pixar movie later on around Indycar? Disney World becoming the regular start to the Indycar season, and being advertised as the 'The Beginning of Racing Season in America'? A 'Junior Indycar' series of some sort, with the flagship being part of the Disney World racing weekend in front of all of the CART teams? CART approving of betting on its races in Vegas? The casinos supporting the races, maybe even the Las Vegas race is a Saturday night wild show with a massive prize pot?) And what if the United States 500, instead of the attempt to upstage the Indy 500, is instead meant to be its wingman? The weekend of the 4th of July, the Vanderbilt Cup to its winner, $5 million in the prize pot (and the winner gets $1.5 million of that), three-wide starts, a limited field that you have to qualify for that you may get bumped from.
1996, instead of the IRL's problems of IOTL, sees the wider Indycar world sees Tony George announce his arrival through the United States 500 (in partnership with Roger Penske, who owned Michigan International Speedway at the time) and the races at Walt Disney World and Las Vegas. The following year, The Texas 500 and California 500 join up, both of them as wingmen to the 'great' 500s at Indianapolis and Michigan, complete with new special trophies for those events? And Tony George, through his company's ownership of the rights to the Astor Cup, has it introduced as the championship trophy for the 1997 Indycar season?
Senna before his death had started working on improving safety in Formula One (as well as other elements of motorsport), so the losses suffered in 1994, even without his death, may well have seen him use his fame to kick-start the improving of safety in racing. And perhaps a possible cross-over between the worlds: Tony George's long-held desire to improve safety at Indianapolis is said to have been driven by the loss of Jovy Marcelo during qualifying for the 1992 Indy 500 - it's said he saw it and that it rather haunted him. If that is indeed the case, can you imagine the most famous racing driver in the world and one of the wealthiest racers in the world joining forces on improving safety in open wheel racing? Maybe that makes the SAFER barrier happen sooner, or perhaps makes the SAFER barrier start showing up on Formula One circuits.
As for Senna, as he aged he was developing many other business and charitable efforts, including developing road cars, selling Audi cars in Brazil (they entered that market through his companies) and his charities, which massively expanded in size after his death. If he's staying with McLaren and Lamborghini (and Chrysler), I could see him one day acting as a driving development supporter for McLaren and Chrysler (can you imagine the McLaren F1, Lamborghini Diablo SV and/or Dodge Viper having their chassis tuned by Senna, as the Honda NSX got so much of its finesse and prowess from his support of the project?) and perhaps he also does the same thing for other makers, perhaps even the creation of a development company (a la Lotus) for cars.