I guess it depends. First of all if it could be proved that there is no afterlife, I suspect most people would want to live forever. To me, nothing is more terrifying than the idea of falling into a dreamless sleep and never waking up... It's not 'peace' since there is no one to experience that 'peacefulness'. It's literally just...
Nothingness. It cannot be comprehended, and what I cannot ever comprehend I tend to fear with a mortal terror. (Pun intended I guess

)
If there was an afterlife, then after a few billion years I might like to see it. Not if Hell awaited though (and it most likely would, after the sin of immortality and billions of years of other sins).
If the possibility of an afterlife was unknown (as it most likely will forever remain), then I'd like to live forever just in case. I mean, how bored do you have to be in order to kill yourself? I'd suspect at least a trillion years old. I cannot really understand people who are bored very often. I mean, firstly there's thousands upon thousands of books to read. The world is full of people, many of whom are very interesting. You could go bungeejump into a volcano from a frozen water-fall. Then there's drugs, if you're really so extremely bored. And in the future you can teleport from star to star with your mind, or something like that. How could an infinite combination of stimulating things ever be so boring that you'd want to separate yourself from it totally, to perhaps be cast into a void of nothingness for all eternity?
And the best thing of all: think about it... An eternity of living would mean an eternity of time not to worry and be lazy!

For my kind of people, who regret every little mistake and missed opportunity, it would be a huge relief.
I guess this Woody Allen quote sums it up best for me:
“Rather than live on in the hearts and minds of my fellow man, I’d prefer to live on in my apartment.”

Ofc, best would be to do both: be alive both in my flat
and in the hearts and minds of my fellow men and women. Just don't come ringing my doorbell too often!
