I think I see where this is all going. Kim and Moon decide to peace agreement maybe even unification. Then Trump and Kim have their talk. Kim says he will denuke but only if US troops leave the peninsula. Trump says only if you denuke first, Kim disagrees and says all plans of peace with the south is off the table. Now the international community will look at Trump as the spoiler for peace agreement. This whole thing may be nothing more than a stunt by Kim and his Chinese masters.
I share your skepticism, but am hoping for the best. Trump is leading a strong foreign policy team. I doubt Bolton or Pompeo will settle for anything short of total de-nuke by Fat Boy. With that, I would remove US troops over time.
My FIL served in both WWII and Korea, and he feared the NK/Chinese till the day he died.
I don’t want all of our soldiers who gave all during the Korean (Police Action) War to have died in vain because the USA was double crossed and gave away all leverage. I don’t trust the Norks, Chicoms, or to a lessor extent South Korean politicians.