Yes! I've been saying this for a long time. I'll happily buy an (unsubsidized) iPhone for $400-500 and a $30/month data-only plan. Maybe with an option to add pre-paid voice minutes (I currently use far less than 400 minutes/year on Virgin Mobile). Clearly with today's announcement this is doable.
The problem with the iPad is that it's too big to have in your pocket, which makes it seem about 100 times less useful to me. An iPhone with the same data-only plan would be perfect. Until then, I won't buy one.