<br>Didn't Dyson solve this problem by simply runing slower and slower over time? I can look the paper up if someone wants. This is hard for biological entities (though you could consider cryonics to be a form of this) -- but once ones mind is uploaded running at slower and slower clock rates isn't a big deal.
<br><br>The real problem is going to be whether or not protons decay. If they do one can probably only exist as some kind of photonic cloud.<br><br>The long term prospects are discussed in The Five Ages of the Universe -- though they don't get into how one preserves "minds" as thing start to decay towards the "dead" universe.