You could count Samba 2000, but I mean, it never came out here.
I think it is a bit soon to pull the "sequel-less" card on last gen games.
I definitely don't think so. With the way the games industry is going these days, your game has to suceed in the first year (most times shorter) in order to get a sequel. I highly doubt UbiSoft is going to pull a sequel for Beyond Good and Evil because it sold like utter crap.
Ahhh! I wish I had the link with me but Beyond Good and Evil actually didn't sell like crap at all, it sold rather well. In fact, the game was originally meant to be part of a trilogy (if you've beaten the game that part is kind of obvious). I'll make an edit to this post if I find the link.