I find this a doubled-edged sword. Monocultures are said to foster a culture of laziness, apathy. This hasn't been the case with WebKit.
Don't get me wrong - competition is healthy. I'm simply thinking of how Jovinder experiences the web.
I've lost track of the number of times I've had to pretend to be something different (desktop Firefox, default Android, Mobile Safari ...) to make a website usable. Every time I have a fresh Firefox install on Android, the first extension I install is Phony.