Sure, but hardware is always getting better; reaching the point where we can build a thin laptop that's up to gaming is easier than online-based gaming. Frankly, the laptops we have today should already be up to whatever it is we want to do with them.
For me personally, that works too. If the price points are comparable then I would prefer an offline experience for single player games at least. However, for multi-player games I could imagine some optimizations that could be happening in the cloud giving them an advantage.
