Not sure how they will ever handle the heat issue, unless there's a special dock that will also cool the phone somehow. Still, a dual-core 2.5ghz would be on par with higher-end laptops today, and powerful enough for all but the most intensive apps - assuming you have at least 6 gigs of ram in your phone (again, depending on the app). That would be on par with my work laptop, if we can dual-boot windows
I wouldn't blink over spending $1k for a phone that could also be the guts of something like the Asus Transformer - still GREAT value for what would basically be a 3-in-1 device.
More than likely, when my home laptop dies I'll be getting something like the Asus transformer, or a tablet with a detachable keyboard. I don't know, tablets are fun to play with but I find for any real amount of entertainment you end-up having to prop it up because it's a pain to hold.