I think you guys are forgetting something very crucial and important. Programming a game takes time and making the figures as well. Disney infinity was suppose to release early 2013 but got pushed back to an August release. Disney was anticipating Lone Ranger to be a big success. You had Jerry Bruckheimer and a big chunk of the Pirates of the Caribbean film team, not to mention Johnny Depp to really hype it up. Disney thought it was in the bag. Then they announced the Lone Ranger characters for DI before the movie even came out. Lone Ranger released to theaters early July, bombs, and I'm sure the figures were already made by then and the game already programmed since DI would release in August. You can't just not release the DI characters or erase them from the game so close to release. Side note... I think the Lone Ranger playset was the best, so something good did come from that.
Now the not so great and powerful Oz? That released to theaters early March. Plenty of time to tell China not to produce those figures, plenty of time to erase it from the game. It's easier to delete then to program so that's why we don't see Oz in the game.
As for GOTG? I don't want to sound like Disney thinking its a for sure hit like TLR, but...it's a for sure hit! You got the Marvel team to count on to make sure it works out. You have the success of all the other movies for more support. Not to mention the Gaurdians have a key role in avengers 3 working. That's right, 3 not 2. They are all leading up to the infinity gauntlet from the comics (totally different "infinity"). You had the the Tesseract from phase one Marvel and Avengers, in Thor 2 you have someone chasing the Aethor, and now in GOTG you See Star Lord trying to grab this mysterious blue orb Indiana Jones style. That makes 3 gems of 6 for the infinity gauntlet. So that's my speculation why it's gonna happen.
Anyways, aside from everything I just said, the real reason why we will definetly have a GOTG playset...ROCKET! I mean come on!!! It's a machine gun shooting Raccoon for Pete's sake! Lol!
Anyways, that my 2 cents! Sorry it was long!