People went to Firefox because it was head and shoulders better than IE6 for regular use - popup blocking and tabbed browsing were the most obvious examples, but even then (and being advertised on Google's front page), it only for about 35% of the market.
Now let's say it'll be a bit faster than Chrome. Let's say it'll be twice faster than Chrome, with better deep extensions coming back, it won't make a difference. Chrome is too usable.