There's no need to delete your characters (people are so mean). Simply go to the billing site and cancel, then reactivate when you like. They hold characters up to six months, and maybe more.
Just go ahead and cancel it, go through with the survey. Your toons will still be there waiting for you when you start back up. I have yet to hear any confirmed reports of anyones toons being deleted by SOE over lvl 10 no matter how long the account is inactive.