I think we should list them.

1. Could try and replace controllers.
2. Could be used with RPG's

Carry on the list people!

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Play Hard, Die Harder

I can't see how Natal could possibly replace physical controllers. My understanding of the technology is that it's very limited when it comes to three dimensional movement. I can see it replacing physical controllers for certain types of games though. Racing games, RTS games etc might benefit from being heavily based on Natal - or something like it.
And what would be wrong with an RPG that used Natal?

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The only thing worse than beating a dead horse is betting on one.

3. It will spontaneously combust.
4. It will kill my father.... and rape my mother (Cigerates do apparently)
5. It will cause people to make senseless threads bashing it before the thing comes out.
6. It will cause a office worker to jump out of a 50 story window after reading that the latest C&C game will be coming out for it.
7. It will cause me to ask, What's wrong with an RPG using Natal, that to me seems like on of the genres Natal could be well suited for.

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"IrishMorn"
If Adon and Sagat step in....ah, what the hell, I'll get drunk and join in on that one.

8. It could RROD

Crappy launch titles, such as only having gimmicky games involving hitting balls

everything... riots in the streets for one.

personally i hope for Natal to fall flat on its face it looks so....

yeah all i could think of putting there was foul language I mean the whole replacing headsets would be but ffs its too gimmicky apart from that Its a blatant rip off of that eye toy thing that the PS2 had I mean first Microsoft steals the Mii from Nintendo (sure they did it better than the Mii but... c'mon) and now this... I mean ffs Microsoft stop being so gay

I will never buy it EVER!!!!

if however it was supplied for free....