Fingers crossed, that would make me very happy. Land loss hurts way less than decades of finlandization.
Would have to be a -very- quick process, every day of negotiations would be a massive danger to them, and based on how it went with Finland and Sweden I'm sceptical of that too. And of course US commitments to defend EU Nato members, based on political whims.
You're talking to a Finn whose grandparents on both sides lost their homes to stalinist USSR. A sapling of a plant they brought with them grows in my yard. I've visited the locations and met the new inhabitants (normal people). Trust me, I know land loss sucks. War also sucks, and much as I hate realpolitik... sometimes there's realpolitik. Of course in the end it's up to the Ukrainians how long and for what they are willing to fight, with access to whatever aid (hopefully more) they have.