Oracle and SUN tried pushing this idea ten years ago, but no one bought iinto it – chiefly because they were unwilling to hand their data over to a third party for storage. Attitudes have changed and that’s less of an obstacle – fears of identity theft, notwithstanding. Having said that, we didn’t have the infrastructure then to support “network computing”, and we still don’t have it. Applications expand to fill the bandwidth available, and I don’t see the sort of quantum leap happening that ubiquitous web apps need to expand into.