I'd rather say it's a nice side benefit of making cameras with a short lens register and not much more.
It's back to the future. Registrations only got longer because viewfinder / focusing schemes for compact cameras decades ago were not up to the task of focusing macro and tele lenses, thus the SLR was born.
Half a dozen decades later new viewfinder/focusing capabilities thanks to electronics are enabling a return to shorter registration cameras.
Sure, it's a happy accident that short back focal lengths mean lenses from longer BFL cameras can be easily adapted, but the decision to design slim cameras isn't accidental and surely the designers were at some level aware that their cameras would be targets for enthusiasts and non native lenses - a good thing.
This all feels like a trend to me, one made possible by advances in EVF technology and in part due to acceptance of rear LCD only "finder" cameras.
Ricoh has been able to deliver an M-mount aps-c module that has been optimized for rangefinder lenses at a cost of less than $1000.
Not even that, $649 USD retail at authorized dealers. This pricing makes me hopeful that a full frame module from Ricoh could come in under $2,000. Bet they'd sell out quickly.
I'd be willing to buy such a module or a FX rangefinder-lens friendly compact from anyone, even if it were, M9-like, strictly focused on the needs of photographers and not videographers, especially if removing such features makes it possible to keep costs down. Might be nice to have in body stabilization though.