I do think it's pretty pathetic though that Phase doesn't believe in their own system to sell well enough without locking out other systems. Says a lot about how they perceive their own devices (not well).
^ This is an excellent post, and is what would make the most sense for fuji
Although
From what I've read, Fuji is already heavily involved in designing or manufacturing hasselblad lenses. And could easily use an existing lens mount, or create adapters (would have to support auto focus etc).
I know a lot of people who say there isn't the market for medium format- like sure, not when it costs 50grand to get a kit.
Sell a body & sensor for like 8grand, make sure it can tether to capture one. or at least provide lightweight reliable tether software that capture one can then import images from. And you'll have the biggest share of the MF market.
I'd say lightroom tethering would be a bonus but you'll never see a commercial photographer using it. especially not to tether ugh.