At that point a gap would exist for a new model. For reasons of price, security, performance, etc. there is still a lot of room in the market for desktops. But the fact of the matter is that there are pros that want maximum performance, which still is a G4 desktop and consumers that want maximum cheapness, which is still an iMac. And both of those lines have had the same form factors, etc for a long time. The thunder at MWNY will most likely come in the form of new desktop machines made to go with the recently expanded line of Apple LCD displays.
Rumors are like playing whisper down the lane.
Sure, Dell and Sony offer about 10 laptop models each. And they already have the turnover. Apple doesn't and they cannot jump into it, either. Their reduced model load is the reason they can beat the industry on inventory, overhead and margins. Maybe in the future, just not now.