I think you have that backwards. It's inside certain niches that people are still building stuff in Rails and other decade(s)-old frameworks. Now it's node.js a

I think you have that backwards. It's inside certain niches that people are still building stuff in Rails and other decade(s)-old frameworks. Now it's node.js and react, to name a couple of examples. By 2020 something else will probably be the hotness. By 2025, those frameworks will still be around, running established systems, but won't be very interesting to any new developers.