Open source works until it doesn't... or until it goes against the best interest of the company touting it. It can never fully last in our capitalistic (and greed-based) society. As already stated, UI overlays will remain... If they didn't, the manufacturers would simply get stuck in a hardware cat & mouse game, and have nothing more to differentiate. The manufacturers have more power than we think, b/c they're the gateway to the carriers, who in turn have all the power with consumers, at least the way America does wireless, anyway. If Google pissed them off, it's not entirely unthinkable to see some carriers say "fine, we'll go check out WP7 and webOS". But Google will not do that, so I don't think this is as big of a deal as it might look at first.