Sure, it would have happened eventually, but not in the 1–2 year timeframe you mentioned. Not even close, judging by the lack of progress from other vendors.
3G wasn't the deciding factor, the first iPhone didn't have it but responsive sites started popping up right away. There's also no point in 3G for web browsing unless you have a decent rendering engine – WML and XHTML Basic sites were hardly data hogs.
3G wasn't the deciding factor, the first iPhone didn't have it but responsive sites started popping up right away. There's also no point in 3G for web browsing unless you have a decent rendering engine – WML and XHTML Basic sites were hardly data hogs.