It is clear that not everyone shares your views. Personally, the only SMS messages I have ever gotten on my current phone are the promotional ones from my carrier. I have no use for, and no interest in SMS. Likewise, I use my cell phone for voice calls perhaps 3 or 4 times a week. So data's what I'm REALLY interested in.
And finally, to be frank, you have little knowledge of what data usage will be like with the iPhone 3G either. I am assuming that you have been using a jailbroken iPhone on Rogers EDGE. The advent of push email, sync, including pictures, with MobileMe, and the new App store will dramatically increase data usage overnight. Many American iPhone users, who have been using iPhones legitimately for over a year say unlimited is the only way to go. Mac pundits like Leo LaPorte have confirmed that anything less than unlimited plans will put a severe crimp in the user experience. I don't want to buy a mobile computing device, just to have to keep myself tethered to Wi-Fi to use it for its intended purpose.
And with all respect to Aristotle, the nearest public "hotspot" to me is over 3 hours away, and the whole idea of moving to 3G is so that you get access to a high speed wireless network without being tethered to Wi-Fi. On the one hand the wireless industry totes all the new, powerful features of 3G, including "near-Wi-Fi speed," and then the carriers put draconian limits on it so you can't take advantage of it. Not good enough.