Way too many ASSumtions here, Ian. You ought to know better..!

What's the price? What's the weight?
Don't kid yourself that OMB's are the majority of the keyboard market. They might be the majority here, but we all, if we dial back the egotism just a tad, might acknowledge that we don't determine the market (or arrangers WOULD rule the roost over WS's!) in the least. Heck, most stores don't even CARRY TOTL arrangers!
RD700G's, CP-300's, SD-1's, ALL of these extremely popular keyboards sales-wise are FAR in excess of what most here are willing to cart. Not to mention B3's, of course.

So the V-Piano, even if a fair bit more than a CP-300, will probably be willingly lugged around by the same players as are now willing to lug these other behemoths (by S900 standards

).
SOME players still consider sound more important than weight. Not many here, but sales of stage pianos (which probably outstrip all arranger sales short of the 'toy' sub-$700 ones) show that many are willing. And yes, I've seen MANY major 'pros', recording artists, out and out pianists on stage with Yamaha CP-300's, Nord Stage's, Roland RD-series and even ancient Korg SD-1's... I don't see why they are going to turn their nose up at this!
As realistic as this sounds, as customizable as it is (sorry Ian, but you MIGHT have noticed the new Yamaha you linked to is still an old-tech SAMPLED piano, not a trace of modeling) as able to be imbued with the individual character each player wants, I predict you'll be seeing these in favor of REAL pianos (maybe gussied up in a piano case like so many already do) on a lot of TV shows and on many, many records (and unless you look real close, you won't know it's not a real piano!)...
And yes, if it feels right and I can afford it, it is going in my collection as fast as I can. I will probably put my upright up for sale if this plays and sounds as good in person as the demos do. Just to be able to instantly chose your intonation and inter-string tuning so easily pushes it into a realm that digital pianos have never gone before.
So what if it doesn't have other sounds? I've already got THOSE covered. Or one of these and a Nord Electro3 on top, you've got the ultimate 'meat and potatoes' rig...
Mark my words. This changes EVERYTHING!