I think the real future lies in a "Do Everything" (well, that is) device. I have a T-Mobile MDA, which is a great little Pocket PC Phone (WM5) that does quite a bit, though it's almost painfully slow (even thought mine is OC'd to 240MHz from 180MHz), does not support 3G, and lacks a VGA screen. However, I have 802.11b, Bluetooth, GSM Worldphone, a QWERTY kb, and EDGE. I have every app and util I could ever want, AND, I have SKYPE MOBILE on my MDA, and IT WORKS GREAT! The only issue is that Skype saps every MHz of CPU so I can't multitask (at all) while Skyping. I've been able to carry on uninterrupted conversations with people from all over the world while at a T-Mobile Hotspot at my local Starbucks, or at home.
A device like this with more CPU, a better screen, and 3G support will allow anyone to do EVERYTHING (Text, Work, Phone, Skype, Surf, EVERYTHING!). That device can only be another year or two away, at which time I can toss my laptop altogether in favor of something that fits into my pocket and does more.