No- not just for 3g. From what I understand, edge is more prevalent than 3g here on long island, and "slow" service beats no service anyday. Besides, when I am actually getting good edge service, web pages load plenty quickly.
Now here comes the but: I'm sure that the next gen iphone will have much more than just 3g. I hope that apple will do the right thing and not differentiate iphones with software, and instead with hardware. I do plan to buy another iphone when it actually has enough space to comforatably fit all of the music I have/will ever have and a few videos (maybe 30gig, though hopefully more).