Free will can only disappear if it exists in the first place. But supposing it does, what makes you think free will necessarily disappears?

It becomes infinitesimally small ?

I'm not aware of any literal Biblical text about "going to heaven", much as how most simplistic, popular depictions of a heaven or a hell seem to have little bearing not only on the text of the Bible, but on theology as well.

For that matter, the notion of a "paradise" for good people or 'heroes' upon death, and an underworld or place of torment for the wicked (as well as an "intermediate" place for people who were neither particularly good or particularly evil) seems fairly ubiquitous to many historical religions, including pagan or polytheistic ones, such as Greek or Roman folk religion.

To me it seems like some sort of sanitarium in perpetually. Something horrifyingly undesirable ... — Wallows

No.
Don't play with other people's deepest ideas. If you don't like the taste, choose another flavour. Heaven as undesirable is just fucking about.

How about: the sheer ecstacy of being in heaven reduces the temptation to sin to vanishingly small levels.

I should become a theist.

To me it seems like some sort of sanitarium in perpetually — Wallows

Welcome to where time stands still. No one leaves and no one will.

I'm unsure which comment to accept as the answer. Please discuss.

For what purpose would a will be needed in heaven? IF, as has been suggested, being in the presence of God is like (LIKE, mind you, not the same thing.) an unending, and perpetually great orgasm. It just feels great to be in heaven. What need of a will in hell? For that matter, if determinism gets you through life in one piece, what need of free will here?

Milton proposed that Lucifer (bearer of light) rebelled; "better to rule in hell than serve in heaven". But Lucifer was never a mortal, and Milton isn't canonical scripture. Lucifer was a native heavenly being. Mortals are not.

Heaven is a nice idea; I don't believe in it. I don't believe in hell either. And I don't think we have complete free will here. We have instances where we can, perhaps, freely choose something. A lot of the time we don't have much choice.

“Free will” in an incompatibilist sense is a bad thing anyway. You want compatibilist free will, which would not be lost in heaven.

Sighs of relief! And, I'm done analyzing the logic here.

Over and out!