While I doubt it'll affect the success of the film but with Rebecca Schaeffer surviving ITTL she may get the role of Mary Corps one.
I think it might actually. Sofia Coppola's performance was pretty bad and Mary was a central role in the movie, at least in terms of the emotional arc. A more experience actress, one who had time to get prepared properly rather than being thrown in at the last minute, could do a lot more with the material and lift the scenes Mary was in. Wouldn't fix everything, but it would remove one of the largest weak points.
Of course the important fix is just paying Robert Duvall what he deserves so he comes back at Tom Hagen, but Coppola probably still is not in a strong enough position to force that through.
Go back to brass tacks for the new Disney-BBC collaboration.
And if the BBC decides to make Doctor Who properly again the Disney-produced version can always be retconned as an alternate universe.
Terrible Flashbacks to the Universal-BBC TV Movie.
In any event Disney wont touch 80s Dr Who for the reasons the BBC dropped it - audience figures were going through the floor and had been for years. It's one thing to import a successful show for a US adaption, quite another to go after a failing overseas show. Maybe when the timeline gets to the mid-90s when the OTL TV movie was made it might be time to think again about it, but I remain hopeful the Tardis can steer clear of the House of Mouse and all it's US brethren.