Seem that this one have a lot of operators support. Maybe its enough to build to some critical mass. And is not about doing native, specific OS native apps, but web apps. Those apps could have a potential market far bigger than just those phones.
What could worry me is speed, at least the presented ones were somewhat middle/low end phones, and web apps are considered to be slower than the native ones.
In the other hand, as an open os, probably should be soon derivative OSs and tweaks and even native programs for it, even if is not the idea of a browser based OS.