Just saw the Red Letter Media discussion... A few thoughts....
1. I'm hesitant about predicting the imminent collapse of the Hollywood studio system when the box-office of these movies is consistently breaking $1Billion. Quite the opposite i.e. more of the same. There's enough cashed up teens in emerging markets in the developing world that haven't grown up with the same movies we have - so it's all new to them. Just because you don't like something, doesn't mean it's going to end. Slavery lasted for centuries - in other words, something can be morally wrong but still be financially successful.
2. The opera/classical/Shakespeare world has lasted for 200 years with a business model of recycling the same works over again. If superheroes movies are the default template, then whoever are the hot, young 'popstars du jour' can be inserted into the roles. There's always a next generation of stars&starlets coming through. There'll be some updated effects as rendering times/costs come down. There's still plenty of old material that hasn't been given the 48fps, IMAX, 3D treatment - so at least there's a thin veneer of 'freshness' for the next decade. Also, MPAA standards change over time, so what was 'R' rated in the 1980s is PG13 now, so that's something the studio can market as new.... i.e. 'it's darker'.
Same template but new actors, more effects at higher-res, and a few more F-bombs, with each incarnation. Doesn't matter if the scripts are identical. It's been obvious for a long time that movies are NOT punished for having poor scripts.
3. Hard core geeks that whine about the the current vacuous tentpole movies should stop seeing them.
4. The studios might claim in response to Red Letter Media... we DID give you a NEW tentpole movie this year JOHN CARTER, and you bastards didn't see it. We lost bigtime on it. But when we served up Avengers, everyone saw it twice. Fine... now you're getting another five Avengers.
[I personally think this ever-decreasing reboot time trend sucks as well, but I'm just trying to see it from the studio perspective. I too saw Prometheus, so I'm guilty of supporting lazy tentpole schlock]