I'm not sure I agree with all your points. For programming languages hopefully Python and Ruby will not be going away anytime soon. Javascript mind share is also continually growing.

For databases, weren't there other reasons people got excited about NoSQL databases? Not having a schema was one aspect of it, but it mostly had to do with scaling. Now people realize SQL scales just fine for pretty much most of the use cases that were getting replaced with NoSQL. And also that most data(in webpages at least) is relational in nature.