Beware of appearances.If Full frame is the simple solution why Nikon is still non-profitable. Nikon has a full range of FF & APS_C cameras to choose from.
Sony cameras are very good at marketing their successes but the fact of the matter is no one in the public knows their financial position because it’s always hidden within larger groups. In fact the camera group has been shuffled around within Sony Corp numerous times which doesn’t instil too much confidence compared to shining stars like Sony Semiconductor or Playstation.
I’m sure they’re in the black now (actually maybe not this year cos everyone’s in the red except maybe the Canon juggernaut) but the likelihood is they spent many years in the red developing their system before benefiting in their current position.
Developing a system is expensive. That’s what Nikon and Canon are going through now.
Same thing is happening in L-alliance. It’s a new system and it costs a lot of money to develop except Canikony controls something like 90% of the market. It won’t be an easy road and no guarantee of success.
If there are no simple migration path for m43 users to go to L-mount (if that is their goal), what incentive would there be for those that want to upgrade to FF go with L-mount instead of Canikony.
And for those that don’t want to migrate at all because m43 fulfills their needs, killing m43 would just kill your revenue stream in helping develop L-mount.