I plan to sell my netbook, but not my MacBook. It will get replaced by a MacBook pro or MacBook air refresh some time in the coming year.
There are quite a few things that the netbook does better than an iPad, including file management, openoffice.org, gimp and more. But I'm more inclined to carry my iPad when I travel than my netbook. I expect iPad shortcomings to be addressed in OS4 and more later. The iPad is a netbook replacement but not a MacBook replacement... Yet. I do remember reading that iPad is outselling all Macs combined. As iPad gets better, sales can only improve.
But to return to the OT, no not a MacBook replacement just yet. But wait a bit longer...