This makes me think of the Mark Twain quote, "The reports of my death have been greatly exaggerated."
There have been changes to AL, certainly. Content has been pushed downstream to the DMs Guild. Adjustments to how WotC and AL interact. I was surprised to see such an apparent small amount of Season 6 content announced, but that's an impression based on very little info other than the announcement. The community itself, at least in my area, seems robust and enduring.
I think that the small amount of announced Season 6 DDAL/DDEP content will be mitigated by the amount of CCC content starting to pick up. We just premiered a couple of CCCs at TotalCon and they will probably land on DM Guild sometime during season 6. I assume that there will be a fairly large number of other CCCs that will also become available at some point during the season.