Whilst I agree it's coming, I think the degree of film/game cross over you are talking about will be tricky to deliver purely because of the differing lead times.
Assuming you're starting from scratch a half way decent game takes a couple of years to develop, whilst a film of the same calibre can go from lunch time meeting to premier in a fraction of that time (the record is the film Wag the Dog which was made and released in 28 days as a bet)
The only way you can get a film and a game to stand as equal partners is if they are seperate from each other but inhabit the same universe. If a film becomers successful the games developer needs to be looking then at getting a stand alone game out for the sequal two or three years down the line.
The Marvel film franchise (Warner have just set up a studio to do something similar with the DC universe, and ditto Fox to get the Xmen and Spider-Man films closer together) is perfect for this since the films are coming so thick and fast, and becoming so successful, that why should we play a Captan America game to tie in with the CA film? Why not an Iron Man game that's taken three years to develop but that references Captain America? All you'd need to do is add a relatively short scene that can be integrated at a fairly late stage and your AAA game is getting a boost because it exists in the shared universe.
You must fear your target, yet respect it, like the crocodile respects the helicopter.