15" screens
I think the average computer user opts for a 15" screen if they do not know any better. It's definitely cheaper than a 17" or up. Just like jefhatfield said, the actual viewing areas are so close with a 15" LCD vs. 17" CRT that it wouldn't make much sense to get rid of it completely. If Apple did this, then I would imagine they would sell less displays since a 17" costs more than a 15"....enough to warrant purchasing possible other hardware... 😉