I don't think we'll get to a point where professional or enterprise level creation happens on an iPad

I agree with a caveat; professional/enterprise level creation looks the way it does today partly because of the tools we've had available (Word, Excel, etc). Where I disagree is that I think professional/enterprise level creation will look different in a way that benefits the iPad (this is really hard to quantify which is why its so vague) but, put another way; creation tools for the iPad will be developed, and their outputs will be some alternative (to word docs, powerpoints etc).