If the burbs "die" there won't be a lot of traffic, which means the commute will be a breeze, which means people will want to move there, which will cause a boom, which will bust, causing the burbs to die.
Rinse and repeat.
Meanwhile, I only commute 8.4 miles to my corporate gig in Bellevue. It is 20 minutes before seven, 40 minutes after seven, and 27-30 minutes by bike. It is from the east Renton Highlands. Upscale neighborhood, rent is very low, crime is pretty much non-existent. The Maple Valley trail is just down the hill.
I think the ex-urbs are the the places that will be really be hammered. I'm thinking places like this:
http://maps.google.com/maps?hl=en&ie=UT ... 19226&z=16