i really don't have a problem with pay to play actually. i mean really, servers aren't free nor is the upkeep. i actually like the idea that you only pay to play for the specific games you own/want to play online instead of xbl methodology cause i'm more of a single player kind of guy so i don't really use online pay enough to justify it.
obviously free is always preferable to costs money but i'm perfectly happy to pay for a service that is worth they money. my guess is that pay to play service will be at the choice of the developer. nintendo probably will have free online for all of their games and other developers probably won't use it unless they can really justify the online aspect to the consumer thus limiting it to MMOesque games.
...and just you watch...psn won't be free forever. servers cost a lot of money to buy and maintain.