To be honest, this was another one of their theories that I never could get a handle on.
There were just too many inconsistencies - was there room for all the people? Who would do the really dirty jobs? Lions can really eat grass like a cow?...What happens when the sun burns out? Would fat chicks come back still fat? If not, would they be like the Stepford Wives? (I know - who cares - we are talking eternity without sex) Even if you had a perfect body which did not get sick, what would keep you from eventually having an fatal accident? (maybe die but instantly get resurrected?) What the hell was the point of just keeping all the good folks around forever in sort of a terrestrial zoo? What would be the point of doing science, medicine, art, etc. if we are so dumbed down that we just farm the fields? Eternal life without MEAT? The BOREDOM?
As Long John Silver said in Treasure Island - "HARRGH - Its them that dies will be the LUCKY ONES"