Yes, but Apple also needs to keep pace with the introduction of new cpus.
Right now Apple is already falling behind by not bringing the line up-to-date with Core 2 Duo chips and better GPU card offerings.
Also I think the S...L...O...W Finder is really hurting Apple. I am hoping that Leopard addresses the carbon finder and gets it up to speed.
New users click on the windows "Start button" and a menu instantly appears. They scroll over an arrow and a submenu instantly appears. Then they move to an Apple machine. They hold the button down over the documents folder on the dock. (1...2....3...) a menu appears. Then they move up the menu to say a music folder (1....2....3...) and the file list appears.
These are the first impresssions! 99% of people walk away from macs with equivalent cpus to a windows box thinking that it is slow because of Finder.