Not sure how this will effect market share, as I think alone it's probably too small to judge - but I do think it'll catch on.
Dust is a serious PITA for dSLR users - so anything which aleviates that, even to a small extent, has to be a good thing.
This would also remove the need to clean altogethor for a lot of users - although I'm sure it wouldn't stand up to the level of scrutiny a lot of people here expect, it's probably more than acceptable for most users.
My only reservation is that it makes the sensor filter array more complex - which is bad news for modding it!