photographers are fickle lot though. everyone complains about the camera's excessive weight whilst simultaneously deriding lightweight low-end slr's because they feel like a toy in their hands.
I doubt weight will sway many in the pro market.
the other issue is changing a lens system to accomodate the evils. it would have to be something pretty amazing for everyone to change lens systems.
journalists and sports shooters used to favour nikons up to about 1990ish when canon developed a faster and more reliable autofocus. nikon were slow to respond and everyone switched to canon. nikon eventually caught up but no one could be bothered switching back. canon dominated that market ever since. not because it was better but just because everyone already had a collection of canon glass.
my point is...how keen would nikon/canon etc be to adopt cameras with a new lens system unless it does something great. is there a risk of losing current clientele that are locked in to your brand.