Take Zelda: Twillight princess for ex. What would it be like if they made it online? would everyone be link, only with diffrent colored suites? or would you be able to choose your character? What would the maps be like? Etc, etc.
pick a game that doesn't have online play, and tell me what you think it would be like!
You know Wi-Fi means Wireless Fidelity, right? As in wireless internet? A game can't have wireless internet that makes no sense. You are asking what if games broadcasted their own internet wirelessly. But I guess I understand what you meant to say, and Zelda does have online! It's called The Four Swords and it was probably one of the best games ever!
I think a game that might be pretty cool with online play would be Jak 3. Driving in the wastelands... shooting up Freedom League... blowing up people driving in the wastelands... It'd be pretty fun in my opinion.