Is that really true or is it just films like "Avengers" who make Hollywood's balance sheet look better than ever?
I'm not entirely convinced that the film industry can survive without giant blockbusters like that.
You might say that there's always been blockbusters, but although I don't have any data on this I imagine the proportion of $ that these films make up has only grown over time. Maybe leading to a reliance on a few big hits.
I consider this one of the reasons we've seen a proliferation of super-hero/comic adaptions (an endless supply of material here) and other giant movies tapping into an existing fanbase (Star Wars, Fast/Furious, etc).