So, I called it three years ago. I don't think the reboot has so much to do with a failure on 4e's part as a natural part of selling game rule books. Once you've sold all your players books, you have to change the rules to sell them more. (I'll go out on a limb again and say that even the fan-beloved Pathfinder is getting long in the tooth, expect a revamp in the next year or so). Sure, 4e might have underperformed what Hasbro hoped for, but 5e was inevitable.
But that isn't why I wanted to post. I've learned a lot in the last three years and one of the biggest things is that even if every roleplayer in existence is wowed by whatever 5 turns out to be and switches immediately and unanimously, there are plenty of players available to play in games of whatever homebrew you want to use as long as it's relatively simple and fun.
I was afraid before. Afraid the shifting of the official game culture would leave me outside of the conversation, excluded, playerless. But with some more DMing experience under my belt and some confidence because of it, I know I can have players till the day I die.
So, I hope people that love 4e aren't bummed out too much-- you can keep on playing-- and I hope people don't get too excited to see what Hasbro's going to make for them next. Hey, roll your own.