I think this is definitely one of those "will get us new users" features.
Unfortunately, I think it is more of a "will cost us existing users" features.
Keep in mind, we aren't just talking about the iPhone. We are talking about
ALL new iPods, from those released this year on out. It's also obvious that they are moving towards the Touch-style iPod replacing the rest of their full-sized lineup. I suspect that next year we will see the Classic will go away (hopefully replaced with a hard-drive based Touch).
I really don't see why the "use iTunes as Handheld" system can't be made to work. It's baffling. Seems like a poor business decision. FWIW... I did forward my concerns onto Apple. I imagine when they get a few hundred thousand complaints they might listen. Until then, you're probably on your own.