I don't think anyone can predict that, not even Google cant predict whether or not they will ban you in the future. Just stay on the ball, follow their TOS closely and monitor your clicks for any unusual activities, I think these are the only things you can do. No point worrying about the future because no one knows.....
Look and think about the present situation and enjoy it. Never bother about what will happen in future as long as you follow the TOS both in letter and spirit. If you keep on worrying what will happen in future, you are bound to loose the present happiness. Be happy and prepared to face the future, come what may!
you can check to see whether your site is in compliance with adsense TOS or not. if it is and if you are not doing anything funny, then there is nothing to worry about
Just keep working to Google Adsense TOS. Also, be careful of advice people may give you. I got one site banned for misplacing ads. I got the wrong advice from someone.