I think what he/she is trying to say is that this defeat, while shitty, isn't the end - in 4 years y'all can vote him out, and with a 37% approval rating before he enters the office he isn't likely to win re-election, especially as it seems he's provoking trade wars left and right. A recession is probable, a war is possible, but you'll have the chance again in 2 years and certainly in 4 to limit his powers. Be energized to volunteer and organize local groups, and to show up in 2018 and 2020. He's not a good candidate - people just hated Clinton that much (somehow)
I think people are just concerned that in 4 years, the world will be a much different place than we are used to living now. I mean Trump's movement on Russia relationship, NATO, trade, Mexico and all that shit very likely will change the U.S into something very different than what it is now. But I guess we will just have to take it up the ass and wait that 4 years. But even so, with all these alt-right nuts out there, plus the GOP changing the voting landscape, we aren't guaranteed a win for next round even if Trump tanks hard.