Coming in twelve pages late with my two proverbial cents.
Considering that 5e is the most popular edition of D&D by a very, very wide margin, why would anyone expect that the new revision would make radical changes? Why would anyone even want that? If you want 5e changed that much, then 5e might not be for you. Which is fine! Check out Pathfinder or Shadowdark or 13th Age or Dungeon Crawl Classics. They all have their virtues. I'm a 5e fanboy, but I've play other systems and like those too. If 5e isn't your groove, that's cool.
But 5e is going to stay 5e, just with some much-needed tweaks and polishing. Good. 5e is the best iteration of D&D ever and it's been a juggernaut for a decade. People aren't ready for 6e, and Wizards can't be ready to kill their golden goose, so it shouldn't be a surprise that the silver anniversary edition will not be 6e. Nothing too radical is going to happen. Nor should it. I'm surprised that people expected otherwise.