Fractal - Leadership position on many fronts well known
No, not many. It's just horsepower and sound. Seriously, over here, FAS is completely irrelevant for "the market". Pretty much noone plays their stuff, at least compared to all the others. It's a super-niche product. They could change that any day but apparently decided not to.
And I also don't see Kemper going out of the market any day soon. Prices may drop a bit, so the difference between it and the HX Stadium is enough to justify purchasing a "lesser" unit.
Also, as is, they have an actually working system to capture amps and an incredible wealth of profiles to choose from. It'll possibly take a year for Line 6 to release "Proxy" and at least another 1-2 years to catch up with captures.
They also have the best sounding reverbs and delays out of the all-in-one modelers (but FAS - see above).
And they have a great live capable unit. I said so before, if I had to choose an all-in-one unit today, for the gigs I'm playing right now, it'd be a Kemper Stage, pretty much without any question.
Sure, things will likely look completely different in half a year, but as long as the HX Stadium is unreleased (and even more so: not tested in the wild), most people will keep using what they're familiar with.