I actually hesitated for years to get a Mac laptop because of the limited input options of only having one button. I finally bit the bullet two years ago and got my 12" PB.
Then I discovered SideTrack. Best program ever. I've got my hardware button setup to do right-click, plus all four edges are scroll areas for vertical and horizontal scrolling. I even have the corners mapped to forward/back for Safari, and to do some other stuff. I can't use my PB without it.
So, in the end, I don't care what Apple does, as long as there are programs like SideTrack that do what I want.