With this whole Web 2.0 noise I believe in the mobile computing space we have just leapfrogged 2.0 and have gone straight to v3. I am done waiting for Flash for Android/iPhone/WinMo. We just need to get over having this for a portable device where connectivity and battery power are paramount. HTML and other web technologies can give us more than we need in GWT to satisfy our web-app desires.
Mobile browsing is the only way that most people get on the web. And that will only go up as people stop buying land lines and personal computers and do more from their mobile internet device (MID).
Today's iPhones and similar devices are already pervasive...just imagine what the mobile computing market will look like in five years.