Actually all LL said was that he was going to use a combination of CGI and animatronics, basically meaning the full shots of hulk would be cgi but like a hand moving, foot stomping could be done with animatronics. The hand breaking out of the ground in the first trailer was animatronic.
Now as for a human hulk, using prospetics and camera manipulation yes you likely could get the look of the hulk but that isn't the only thing to consider. Look at the new hulk, every moment has a reaction, one part of his body moves, another part will have a reaction to that. When he flexes, you can see all the muscles tensing up, the same with the land from the jump out of the tunnel, all his muscles react to the impact. This isn't something you can achieve with a guy in a suit, even with animatronics, they wouldn't have the same effect.