I know you don't want to hear about how the Nats can't make the playoffs. Ok, then tell the Nats to stop losing two at home to the Mets. Your anger is misdirected.
Most of the time 4-2 is a completely acceptable home stand. It seems bad because it started with a 3-0 sweep, but if you go .500 on the road, and win 2 out of 3 at home you're looking at a 94-95 win season. If this were May you'd say "keep on keeping on" and gently glide into the playoffs, maybe even as a #1 seed.
It's not May. It's September, the Nats backs are against the wall and being " generically 95 win good" is not even good enough. They need to be the best team in baseball this month. Simple as that.
Playoff Odds :
Ten game road trip, the absolute minimum they can go is 6-4, but that's probably just treading water or gaining a single game. It would also likely force the Nats into a homestand where they need to lose a game maybe two or find themselves in an impossible situation. 7-3 or 8-2 would at least keep the "win 'em all" calls at bay for another week. They've already lost game one here though so it's going to be very very tough.
One note :
By now you must know that Jayson Werth has been the best hitter in the NL since the All-Star break with a .357 / .444 / .629 line. (just to note how capricious these things can be so you don't expect "Super-Werth" next season, I'll note that the 2nd best hitter in the NL in the same time frame is Wil Venable). Did you know that Anthony Rendon is among the worst? .209 / .286 / .299. Forget having Espinosa around for his D. Maybe these guys should platoon.