Why on earth would you buy a console that requires always-on connection? It's not even about the internet requirement. It's also the fact you won't be able to play used games.
Not being able to play used games don't bother me. I don't think I've bought a used game for either the 360 or PS3 and if there is a game I want to play I usually wait until it hits a bargain price. I already leave my PS3 and Xbox 360 running for days on end so having an always on internet connection doesn't bother me.
Chances are Microsoft will ship with the next Xbox with an always on requirement. That being said, if sales numbers are very low because of this requirement Microsoft will probably eliminate it with a massive update and a removal from future next Xboxes.
Or, as someone pointed out, this could be a feeler and based on negative feedback they won't do anything like this at all. We'll see.
You do realize the whole deal is if your internet goes down, so does your game (even if single player), right? Right? No?
Even if your internet is always flawless, which it is isn't, it poses the question: Why always-on? Well, it's clearly DRM. They will use it to update the system/apps/games, but the main use is DRM. If the Xbox has grown to become a media consumption device more so than an actual gaming console as they've said, then the thinking behind always-on seems rather confusing. Especially coming from MS who's known for their usage-tracking programs on their products, which they later use to base new feature implementations on.
Even if internet outages don't apply to you, this still means you won't be able to take your Xbox and play it on a friend's house; or that friend won't be able to bring his/her game to your house because it just won't work.
Granted this is all still rumor. And I know for a fact this was planned in the pre-production process (my brother-in-law works for MS). What no one knows is whether this is still in place. With all the negative feedback, it might as well not be, but MS has been acting stupid the last couple of years so it wouldn't surprise me.