I’m not saying how poor the built-in default Safari browser behaviors in the iphone, actually it does do a pretty good job in stability and user interface. However, since I’ve been already benefiting much from the plugin mechanism that Firefox desktop edition supports for a while, I know Safari could be able to possibly do a better job.
Giving customer more choices is not always a bad thing. Good product wins in the end, I believe. Time proves. Obviously in this point, Apple disagrees.
I hope the answer is yes, but I doubt, really. Wait and see.
Anyway, I’ve give you some alternatives. If you need WAP browsing, file downloading and some other things, please install UCWeb, a popular mobile browser developed by a Chinese company UC. If you can’t read Chinese, please try Wapzilla, MyMedia instead.