I can't say I think his age or alcohol (is this even a thing with Scott?) has anything to do with it, I wouldn't like to see Scott heavily involved with any more Alien stories going forward.
Agreed. He gave us a wonderful introduction to this universe and then gave us a very divisive couple of follow ups (or rather come befores).
There are plenty of other stories left to tell in this universe but I feel we need others to be masterminding those.
If he does have the blessings of the studio but will be forced to work with a lower budget, then the ball truly is in his court. He'll either walk, or figure out a way to tell a smaller story. Can it be done? Sure. Will he be okay with that? I doubt it. I have difficulty seeing him abandoning his vision for this trilogy, and risk it being given to people who may fundamentally change everything Ridley set out to say.
Its a shame, because Ridley brings so much talent and skill to the game. But he's got his plan and he wants to run with the ball (so to speak). He's forgetting the game is won primarily in the air, not just on the ground. You may run for 5 yards, you might run for 8, but you can throw the ball for 40+.
Let loose of the helm alittle, and let other (perhaps better) ideas come forth.