On the other hand, with the feature list of the Tegra 3 and a bluetooth keyboard, it would make a really nice streaming client/HTPC. And it is fairly open, which should ensure hackability for stuff like a nice TV interface for HN, home file server and probably even gaming ;)
In conclusion, I have the somehow wired feeling that it could be a rather huge success but not as a gaming device but as the break through for "smart TV." And it is somewhat raising hopes, that the developer specials (at $699 and $leet) are sold out.
 I forgot to add:
The $99 price point is very nice, since this is about the highest amount many people are willing to spend without a good reason. So many casual gamers will probably buy one and figure other uses out later.