If a $99 tablet doesn't get the Windows store going, nothing will. At that price, pretty much anyone who wants to try a Windows tablet can.
I agree 100% but I would still prefer this to every update being at the mercy of carriers.
So basically, like many other apps, we'll see updates to Android and iOS and maybe they'll get around to updating WP, but it wont go away.
Still use my original RT daily and love it. Its a little slow now, but still a very functional desktop companion I can take anywhere.
This looks like a really nice, solid mid range phone.