Going multiplat was what screwed them in the first place.
They should definitely put more of a focus on SP games than just MP titles with MT's loaded in them (as well as their own virtual currency).
No, going multiplat didn't screw them. They began designing their games in a way that simply didn't appeal to their fans.
I mean people blame 7th gen console specs for Crysis 2 and 3 being linear experiences. Meanwhile Crysis 1 had a great port on 7th gen consoles.