Incremental sync speed is vastly over rated and not the panacea many seem to think it is. Besides, the 1D from 2002 synced at 1/500 and the 1D MkIV syncs at 1/300 AND, speedlites like the 600-EX-RT, 580 EX II, Nikon SB910 etc have full power flash duration in the 1/250-1/350 range anyway, shorter shutter speeds actually cut your power even when you are not in HSS.I disagree. A FF camera with a sync speed @ 1/500th at that price would be a game changer. The X100 is already a hit with many strobists. It means I can stress my speedlites less, better battery life, and less headaches of battery pack swaps.
Of course you do.
However the X100 sync is a work a round that has it's own limitations, anything short of a true shutterless sensor read exposure and very short flash duration is. The real game changer in this area for serious pros has not been the X100 but the Profoto B1 Air kit, sync at any speed and any aperture, true HSS with a decent amount of power.
And now the Chinese are coming out with their own versions of powerful HSS enabled integrated battery powered studio strobe crossovers at a fraction the price, that is where the strobists that want to push boundaries should be looking, not at leaf shutter hacks.
The history of photography would say otherwise. The game changers have and will be when shutters and strobes will both reach a normal sync at insane speeds at normal prices. Right now, still a compromise with HSS. Scoro Broncolor packs and Schneider LS lenses is what serious pros look to, the average pro would like that eventually and a 1/500th sync FF camera is a good first step.
Edit: The X100 makes your argument against faster sync speeds irrelevant. It already works better than HSS w/o the workarounds.