That was great news, mostly because it refocus debate on the current shockingly poor state of browser performance. Take any site with a bit of Ajax code, e.g. Gmail, and it's guaranteed to be far slower than a client equivalent.
But the world has moved on. Modern client applications - such as games - ruthlessly use native processing power, including rich graphics and parallel threads. Browsers just haven't caught up.
It'll be a few years before most of these efforts come to fruition. In the meantime, Moore's law and a few performance tweaks will help a bit, but we'll be left with great web applications unwritten due to performance concerns.