It's the rest of the fragmentation that doesn't.
No one on /r/haskell seems to know who Rabble_of_One is who has been posting here. I believe the assertions that none of the involved parties would hesitate to speak out under their established names, because they have not hesitated in the past to take strong positions.
Is there a general consensus to move beyond hackage? I thought your work on backpack was still ongoing and bridging the usability gap between cabal and stack, no?
I don't think either Stack users or Cabal users think Hackage should go away; in particular if you're a library author, the way into the LTS is to publish something to Hackage and then ask Stackage to take it.
As for Backpack, it doesn't really have much to do with the philosophy difference between Cabal and Stack. But I have, as necessary refactoring for implementing Backpack, been working on improving cabal-install, including the Nix-local builds feature which is supposed to make Cabal's usability story much better.