The current monoculture is much worse. It's a monoculture where the developers are not supporting the popular thing because it's popular, but also because it's what they themselves prefer. This is much more dangerous and it spills over to other areas. If you walked into a coffee shop in San Francisco you'd be hard pressed to see anything other than macbooks, iphones, and chrome (maybe safari a little bit). So forget about WebKit, there are plenty of sites out there that specifically target iOS and iOS only. This is not going to get any better.