I'd buy it because I pretty much just use it for online gaming. I will admit of the four or five people i've met who aren't into gaming heavily but still own an xbox 360, none of them have connected their xbox to the internet. They just want to play games on it like an atari, nintendo or playstation. They don't care about a new social UI, they don't care about DLC. They just wanted something they can have an hour or two diversion on - they don't live their lives gaming. Something simple that they don't have to think about.
I can see where the always-on side appeals to businesses though. If the xbox 360 required an internet connection to function - i'm sure they would have found out a way to hook it up. Xbox probably would have made money on them too once they realized there was a marketplace with movies, games and other distractions. If the original console had a wireless nic, i'm sure the people I know would have set it up since they all have a wireless network.