I'm cautiously optimistic which is the state everyone should be. Keep in mind what happened from 1994-1998 after the Agreed Framework went into effect. When it came time for the US to hold up their end of the deal, the Republican Congress chose to renege on the deal and drag their feet despite President Clinton's requests and as expected the North Koreans not only resumed their nuclear program but did it at a much faster rate. There is time for Congress to fuck it up, time for the President to fuck it up, time for the North Koreans to fuck it up, time for the South Koreans to fuck it up, time for the Chinese to fuck it up, and time for some other power or unforeseen flashpoint to fuck it up. For something like this, where the ink hasn't even been put to paper, let alone dried, it is way too early to be anything but cautiously optimistic (ok, technically they did have the Panmunjom Accords, but that's basically just a promise they'll sign an accord in the future to end the war which is about as useful as a recruit's commitment a year before NSD; yeah maybe he stays, but maybe he decommits three times between now and NSD too). I am happy that at least thus far, President Trump's gambit seems to have worked.