How do you think Sony will handle trophies next gen? Do you think our online accounts will carry over, or will we be forced to start a clean slate? Tons of people have spent a lot of time getting trophies, I'd hate to think Sony would just say "Oh, well that was fun. Here, now start over."
Trophies are connected to your PSN ID. Once the next gen gets here, all you have to do is log on using your PSN ID and your trophies will appear. Just make sure you sync with the server. The only issue I see with this are all the people that have multiple accounts in other regions and don't remember the email or password of the accounts.