I'm not sure they said it was impossible.
Rather that it wouldn't work in the same box.
But that does not preclude wrapping Abox with an even more powerful system.

However...that isn't happening (and to the best of my knowledge what they are considering for OS4 won't be anywhere near that ambitious).
What our developers are planning is stepping away from complete legacy compatibility (to a new ISA) in order to actually implement the things the other camp has been promising without the issues they will have to face.