Would you be willing to answer a few brief questions about PlayStation Forums?
I think its a good idea. They are just starting to bring more Free to play games into the Ps Store. Plus they already announced Diablo 3. It'd be a great way to add more ps4 sales. IMO.
You should contact Riot Games about it, I'm sure you wouldn't be the first one to ask either (which is a good thing, the more people demand it, the better chances of it coming).