What makes me worry is that through a combination of Chrome dominance and bizarre managerial decisions Firefox will eventually be driven to obscurity no matter the technical prowess of its developers; and then we will be stuck with a Webkit monoculture. Back in the days Firefox managed to make a significant dent to the IE dominance, but this time is much more difficult to develop an engine from scratch as the Web is ridiculously more complex than back in 2002 when Firefox initially appeared. And even then Gecko was already in development for a longer time. However I believe that, eventually, a superior engine will appear, maybe even Servo will be the one. But it won't matter any more because even if that engine is better, more secure, etc., Chrome/Webkit will still be good enough for the 99% (if not more) of users.