Only if we are off the peninsula entirely and it's China with all the regional influence. In that case then yes, I agree with you.
Strange, isn't it? It doesn't make logical sense, especially with Trump pulling us out of the Iran deal, which should be a huge red flag to anyone trying to negotiate with the US. The fact that the chips are all falling into place with North Korea despite all of this is more than a little suspicious.
My line of thinking is that this all will go over amazingly well, despite the blatantly obvious shortcomings of this administration. We will have to make a MAJOR concession, like leaving Korea completely, but the Norks will similarly make their own apparently huge concessions, like giving up their nukes with UN inspections or basically the Iran deal but with Trump involved so of course it'll be awesome.
With us off the peninsula, the threat to Kim's regime is greatly reduced, if not completely eliminated. It also provides China with a key long-term goal. NK won't need the nukes anymore, with their big brother taking over the region.
China is playing the long game here, knowing how badly Trump wants a "win" and doing their part to influence American public opinion to bump up Trump's approval. Short term, this will give them brownie points in trade negotiations. Long term, they know he's is the most effective way to cripple their rival.
Don't get me wrong. I'll be happy to see the Korean peninsula denuclearized (big if whether Kim keeps his word...) and a part of me wants our military out of SK as well. I'm just apprehensive about China's regional dominance in Asia, our government turning a blind eye to Chinese manipulation here at home, and of course fretting a boost to Trump's approval rating, prolonging and accelerating the damage he does to this country.