The domestic market just cannot infinitely expand to support all these productions.
That's why huge international grosses are the aim for tentpole films these days. They may eventually cut back a bit on the number of tentpole releases a bit, though, if there's too much cannabilization. Next year looks to have fewer mega-budget films than this year, although, as you say, 2015 is shaping up to be insanely competitive.
Some will lose money and some will flop big time.
Only then will we get to see more "new stuff".
Most of the flops will probably continue to be the attempts to launch new franchises, while sequels continue to be a (mostly) safe bet. I expect tentpole releases to become even more heavily focused on extending existing franchises through sequels, prequels and spin-offs.