Well, I for think he will eventually come back from time to time. After all, this is a science fiction show and in science fiction death is very rarely permanent. Unless you're uncle Ben or Bruce Wayne's parents.
The only other way to have a permanent death for a main character is when the actor leaves the show for whatever reason.
I still like SG1s time loop episode though. There were some great images in that one. Especially them playing golf and General Hammond screaming at them for doing it.
But while it can be a pain to be stuck in a time loop for ages, there are some great advantages. You don't age and you get to learns lots of new skills.
But if you ever actually leave the time loop and you have fifty years of experience playing the guitar all of a sudden when just yesterday you had none can be disconcerting to those who were outside the time loop.
And if you learn the lottery numbers woo-hoo....