I know probably less than 1% about movies compared to Spielburg, but that said, I know 0% compared to him about the effects of smoking crack cocaine, which is what he did when he said this.
We have more entertainment options than ever. He's mainlining and injecting heroine if he thinks people will pay a shit load more for less movies coming out. I won't, who would? Hell, there are TV shows now with budgets that match Hollywood's most expensive from only 10-15 years ago. Production quality of series like Game of Thrones is competitive with a lot of films.
You're in the ever decreasing minority who still go to theaters. The rest of us have, for the most part, almost quit going.
I am in this group, of course. However, is it because we're getting older? Did your parents go to many movies? Mine never did, it seems like it's always been something youngsters favor.
Given the fact a large TV and basic 5.1 surround system can be had now for peanuts it's amazing people still see movies in theater. There is mainly one reason: impatience. They come out months earlier and people (particularly young) are just too impatient. Is the experience really much better? No. Hollywood would cannibalize their theater sales if they released movies to blu-ray on the same day.
Movies are hellaciously expensive for those who want to get food and pay for a baby sitter, but I guess they always have been:
http://tlevier.files.wordpress.com/2012/03/movie-ticket-inflation1.jpg
I do believe the future is opposed to the theater model. In time, theaters will likely be the laughable anachronisms that movie rental stores have recently become. Our grand kids will listen in awe as we tell them how we used to get in the car and drive somewhere and sit with strangers in uncomfortable chairs to watch movies because there was no other way to do it.