What about "living forever"? According to Eliezer, this has infinite utility. I agree that if you assign it a finite utility, then the lifespan dilemma fails (at some point), and similarly, if you assign "heaven" a finite utility, then Pascal's Wager will fail, if you make the utility of heaven low enough.
It has been claimed on this site that the fundamental question of rationality is "What do you believe, and why do you believe it?".
A good question it is, but I claim there is another of equal importance. I ask you, Less Wrong...
What are you doing?
And why are you doing it?