No...I think Hulk is a character that has failed to captivate audiences, and that focusing too much on him would be a risk. TIH didn't even make a profit until dvd...remember it takes 2 dollars of gross to make back every dollar you spend...on a 150 million dollar budget, they had to make 300 million to break even...that gave them 21 million dollars of profit; very modest when placed next to Iron Man's nearly half a billion in profit (300 million to break even and it made 750 million after dvd.)
I don't like a lot of things about Ultimates but I think Ultimates 1 did a perfect job breaking up screen time...everyone got decent face time, no one overwhelmed the other characters. If they could do a movie like that where the characters aren't total dickwads, that'd be ideal.
The thing is, movies being movies and RJD being the only proven leading man, I almost guarantee the movie is going to center on him almost the way X2 centered on Wolverine/Jackman. The others will be there for sure, but Hemsworth only moved to America a few years ago and got his big break in Star Trek. You see the potential with him, and I hope Thor is a breaking ground for many things in the future. Evans has been in alot of movies, but has never found the kind of tentpole success as an actor to put him in the lead. CA, could be that movie, but it remains to be seen. On the one hand Chris was one of the bright spots of the FF movies, on the other because the FF franchise petered out, I don't know how much credit he will get for it.
My point being is don't expect an, "everyone gets face time". I hope the film will focus on the "big 3" almost in a Star Trek kind of way with Kirk, Spock and Bones. That could work for a movie like this and please fans. Alot of it depends on how well Thor and CA are perceived, the whole project may be shelved if they're bombs.
As far as the Hulk, I agree, the Hulk can't be a "character", but I think Banner can and should be. The Hulk is more of a plot device.
As I mentioned, based on the ending of TIH, I think Stark is being played and seding the Avengers after the Hulk, Rogers could discover Ross' true motivations behind the Hulk.
I do not want to see a full out Ultimates on screen, with the Avengers chasing shape shifting Aliens. That could be disasterous. It's going to be enough to accept the very "real world" Iron Man working with a Norse god, and a guy who's been frozen on ice for 65 years.
If it's the Hulk at least the audience could have something tangeble to go off of, based on TIH, to keep the suspension of disbelief going.