I don't believe any of that. There will always be big budget flops (1941, Waterworld), and if they serve up crap they'll get what they deserve.
There are still plenty of other decent films getting out there, if you look:
https://en.wikipedia.org/wiki/Academy_Award_for_Best_Picture#2010s
The big budget popcorn movies are the biggest gamble but they can also be the biggest earners - Iron Man three grossed $1.2 Billion worldwide, for example.
Another thing is that "White House Down" is just Disney's version of "Olympus Has Fallen", and I doubt people were going to watch two movies back to back with the same premise.
Nothing to panic about yet, but yes it's true that there is some awesome TV around at the moment, it's a golden age, and producers are seeing the value in 13 episode seasons with high quality scripts.
I don't know about you, but I got bored with Depp after the first "Pirates", and frankly this is just another attempt at starting a tired franchise. I'm glad it failed.
The next big-budget attempt is Pacific Rim, which comes out this week. Sounds like a cross between Transformers and Real Steel, I think I'll pass, but it's got $200 million to earn back or something. I suppose it's the right time of year for giant robot flicks.