[rodion_89]

Here's the thing, Apple will throw out a new iPhone model that will have iOS 5 by default. That's huge! People flock to get the new iPhone every time they come out with one.

Another thing is that if you use a Mac and want to use iCloud you're going to have to upgrade that phone (and Desktop) OS. I think many people will be keen on doing so.

[Kylekramer]

While I agree there will be tons of people upgrading via hardware, this article is specifically about making users update their old phones with the genius of iMessage. I have to disagree with that premise. iMessage will be big, but only through nerds who will update and new phones.