Great! Thanks for this conversation. It's fun to dicuss theological arguments for me, especially since it can be tough to find believers willing to engage in logical argumentation.
So, and correct me if I'm wrong, but you feel that the desire to sin will be erased in some fashion from the human condition.
To reflect on your TWA analogy, no one's been 'brainwashed' into not selecting TWA. However, no one has the CAPABILITY to choose TWA, no?
Now, IIRC, you've said that the capability to perform sin would be eliminated in Heaven. Since sin can also be mental, and it is human to sin, some would say, to me it would seem to take some form of mental manipulation to PREVENT us from sinning, even in Heaven (hence my 'brainwashing' example.)
If the human brain is incapable of processing the idea of sin, then it follows that we would not be able to sin (reflections of 1984's paring down of language there). But that still seems like it would almost take a form of brainwashing, rather than a spontaneous free will gesture on the part of everyone who enters Heaven. I assume the latter is your contention?