I mean no distrespect to anyone that agrees with this argument. However, I think this is nothing more than grumpy-old-man syndrome.
First of all, let me refute the claim that sequels are necessarily a bad thing. Quite a few sequels are better than the original. This article mentioned Dark Knight. It forgot to mention how freaking awesome it is! If we want to use a more recent example, I'd point you to Toy Story 3. A sequel isn't, by definition, a bad idea. Some times they're exactly what we needed.
My main point, however, is to ask the following question -- if Hollywood has supposedly run out of good ideas, how is it possible that there are so many terrific movies every year? Some of them are indie, but some of them are Hollywood studio productions.
I will concede that there are probably a greater number of crappy movies being made. There are a greater number of movies being made, overrall, and a lot of them are crass commercialistic money-making-schemes, in which the art comes a distant-second to the top priority of profitability. So, we have to wade through a higher percentage of crap to get to the good ones. I don't care.
Thirdly, it's not really fair for the author to use Summertime as their only measuring stick for this article. Ever since Star Wars, Summertime has been the money-making time for studios, and that tends to be when they put out their predictable teen-driven cash-cows. The author of the article conveniently left out the rest of the year in their analysis of the industry.
And finally, one of the authors' main premises is just plain false. The author pre-supposes that this Summer will not have an Inception. How the heck do they know that?
Super 8 JJ Abrams is doing a loving homage to the Spielbergian adventures of the 80's, with Spielberg producing? That is a good idea.