This is the same thing people said about Pixar and Marvel. With Pixar it was "IT'S GONNA BE ALL SEQUELS NOW THAT DISNEY TOOK OVER! PEOPLE ARE GONNA GET BORED!" and in reality we got 3 brand new films (Rat, Wall-E, and Up!) before Toy Story 3 followed by more original IPs afterwards (Brave and the new films) . With Marvel it was "YEA BUT THE RIGHTS TO ALL THE GOOD CHARACTERS ARE STUCK AT OTHER STUDIOS! OUTSIDE OF IRON MAN DISNEY CAN ONLY USE OBSCURE CHARACTERS. THEY GOT RIPPED OFF!!!111" meanwhile in reality land Avengers and Guardians of the Galaxy kicked a$$ at the box office.
I am surprised how well Guardians of the Galaxy is doing, even I went with a group of friends who I never expected to be interested in a super hero film and we all really enjoyed it. But, to me this just shows that it does not matter which kind of franchise/IP you buy, it comes down to the merits of the film. So, why buy Marvel for the IP in the first place?