Don't forget the 80% comparison is also slightly misleading if you use android the google maps app uses vector graphics. So the problem is only directly for Apple, and there is a war going on between Apple and Google after all. So I understand why apple wanted to move away, but with their VAST fortune they should be able to release a usable map app, the comparisons that have been made are not unforeseeable.
Finally, Jaquith, I have never used apple maps so i don't know, but the implication you give is that Apple maps will not have advertising products. Is that true?