It wouldn't be, in fact most Christians will self acknowledge that it's not a good thing with their explanations for the following series of questions.

1. Lucifer had free will, and existed in heaven alongside God in the same way that we will supposedly exist alongside God in heaven. It was entirely possible for him to defy/rebel/choose to not be in union with that God and be cast out of heaven. Do we have free will in heaven?

1a. If yes, then do we have the ability to also reject and sin once we are in heaven according to the salvation of Jesus?

1b. If we can't, then do we have free will?

2. If God is altering our state of being in order to make us "ok" with living/worshipping forever, are we still the same individual? Or are we being made into a new being based on a change in our values and desires?

2a. If we are being changed in some way to accept eternity as good/enjoy it, then how do you reconcile that with the idea that God wants communion with beings of free will? If he's just going to change us to fit the needs of eternity anyways, how is that different than programming sapient robots to worship him? Why go through all of the trouble with having us choose him via free will if he's going to alter/overwrite our consciousness to make us able to deal with immortality? He might as well just start with that if it's the endgame.

The only way out of the situation is to claim that we do still have free will in heaven and can choose to rebel at any time, or else you're dealing with the philosophy and ethics of how changing a sapient being to want things they didn't before can't possibly coincide with free will.