Steam has little to worry about in regards to the Windows App Store. They just need to keep pushing platforms, keep securing great titles, and RELEASE ANOTHER DAMN HALF LIFE 2 EPISODE. Exclusively on Steam of course.
Steam is pretty great and it's not easy to replicate. See "Google Play."
Probably not going to happen before they release their new gaming console.
They need a good launch title and you know how long it takes them to build a game.
I'm sorry, HN isn't AIM or Facebook. There's no way for anyone to know who you know unless you tell us, and even then I fail to see how the comment is relevant.
Steam is pretty great and it's not easy to replicate. See "Google Play."