Why is this such an issue? It is no harder exiting vim than it is exiting plain old vi, nvi or any other vi clone. In fact, the very same keystrokes that you use for exiting vi can be used in vim as well.
The way the poster uses the specific term 'vim' while asking a question that pertains to vi-style editors in general implies that he or she is indeed unaware of this.
To my ears, it is a bit like asking the question "how do I make a red Volvo 240 from 1982 go right?" to which my reply would be "you do it the same way as you do with any car in general, namely turning the wheel clockwise". If you have never seen a car before and suddenly find yourself in the driver's seat of one, asking such a specific question may make sense. I suppose that the situation is similar for these computer users: vim is the only vi-style editor they have ever seen because it is what ships with the only unix-like systems they ever encounter.
Wait, I don't think I'm helping your case.