And good bye to InDesign, InCopy and all the other Mac applications Adobe makes. I interned over the summer at a certain college newspaper of high-repute...let's just say the school starts with an H...and without the ability to cross-platform swap artciles from InCopy on Windows PC's used for editing and writing, etc., seamlessly to the Mac's using InDesign for lay-out...it'd be out of business.
Adobe would be a huge loss for the Mac community. Perhaps Apple could make a better photo software package in about five years of development... but there would be no cross-platform counterpart. Which would mean an awful lot of things would be switching over to Windows in the long-term.
And I can tell you given a choice between doing design on a Dell or a G5 with a 23-inch cinema display... there is no comparison. And without Adobe it would be happening on a Dell.