I would sell it and buy new rock down the road.. Yes you can seed it with new rock in the future, but a tank will take a lot longer to mature. Also, if you set up again with no dsb (which everyone seems to be doing now) you will need something reliable to convert nitrates in the early development of the tank.. Just what I would do anyways..
Although, on the other side, I wouldn't even consider selling live rock. I don't think it will be all that cheap for that many more years. I think it's a good investment to hold on to it. If I shut down a system, I would keep my live rock alive in a temp tank.
-Adam
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