Possibly, but for the first time in many years I'm considering a desktop as my next computer. I've been choosing a laptop as a compromise between power and portability; but if the iPad can do 95%of what I need the portability for, then I could get a much more powerful iMac for the same price as a MBP.
And I'd only get the iMac for photo and video processing (as a hobby). I'm guessing many people would consider an iPad sufficient to put off replacing a computer or decide to not make the switch to a laptop. Just keep their desktop and get an iPad for on-the-go email and web. Either choice would erode laptop sales.
i am so in agreement. toting the 17" mbp around no more! not going over 3 pounds lol. would love an Air so waiting to see what they do. the ipad is nice but i need a little bit more flexibility right now. the ipad will get there probably next year though.