See, I think Apple needs the G5 PowerBook. Apple will strive off of its installed base first, then, obviously, from attracting new users. The installed base wants the G5. Even people who have recently purchased, within the last 1-2 years, want the G5. I'll be honest. I LOVE my 1GHz TiBook. It does everything I need, but hey, since the company wants to buy me a laptop ASAP, I'll take a new one.
Even if they weren't, It'd be hard to not sell off my TiBook and grab a new G5 laptop.
Now move to the PC side. Like I've said, even a hardcore Mac basher gives credit to their portables and the G5, but mostly the design. Combine them and bang, there ya go!
I guess my big thing is, 250MHz is a nice chunk, but not enough to make me want to move from my PowerBook. I considered it, primarily for the new light keyboard, but the cost was too great to only get 250MHz, AirPort Extreme, and backlight keyboard...especially since my laptop has a full 1GB of RAM, which is pricey from Apple direct. It just didn't pack enough bang for the buck to get me to upgrade.
Now, give me a 1.5GHz G4, now available from Motorola and guess what...I still won't upgrade. Why? Because I know I've waited this long and the G5 *is* coming at the max in another revision, so why give up the fight now?