Eh, I have a soft spot for Portrait of a Lady and Gibson's one and done James Bond. I think a lot of people crap on it because they cast a Yank as Bond, and worse, one whose later work is famous for making the English/Brits cartoonishly evil. Even today, the main criticisms come from Brits upset that an Aussie and an American were ever cast as Bond.
I think Gibson and Lazenby, whose one-and-done In Her Majesty's Secret Service has its own ongoing evaluation, are the biggest showcases that there's room for more one-and-done James Bonds, especially between the folks who take the role for decades.
Dumping Moore was done just at the right moment - he was already aging rapidly, and I think folks had really tired of his campy take on 007. There's a reason they went so hard in the opposite direction for Dalton, making Bond a killer again, and it wasn't just to compete with the booming 80s action genre in Hollywood and Hong Kong.
Keep Moore, he maybe overstays his welcome, makes a real stinker or two, not to mention that they'd likely miss out on Dalton - in OTL, they were very lucky he was available when they needed a new Bond, give Moore a couple more movies, and we either get a delayed or abridged Dalton era for Bond, or none at all.
We miss out on Dalton and pretty much all of modern Bond is unrecognizable - we don't get Gibson/Portrait, or the three Liam Neeson Bond films in the 90s, which while sort of Tom Clancy-ish, had a tinge of that Dalton complexity, and helped Bond survive the post-Cold War era. We likely don't see Clive Owen or Daniel Craig's turns in the 2000s/2010s, which also owe much to Dalton's tenure. Not sure what the Richard Madden will look like when they wrap up Bond 28 in a couple of years, but I certainly don't see them going full camp like Moore.
You know what you get when you go full camp like Moore these days? The disastrous and mercifully cut short High Grant era. The World is Not Enough and Die Another Day nearly killed the damned franchise. Austin Powers and xXx make a bit of money, and suddenly MGM decides they want Bond to be full of sex puns, cheese, and essentially cartoon characters. I mean, my god, invisible cars, space lasers, a villain who kills people by having sex with them, the fucking Madonna song/cameo? You wanna talk about franchise/studio killers, that should be our go to, not Portrait of a Lady.