I miss the days when late night shows were about jokes and talking to interesting people and people in the entertainment industry. Except for Corden (who is quitting to be no doubt replaced by someone else who just has to mention Trump 25 times every segment like the rest of clones), they now are all just copying Jon Stewart's Daily Show....poorly. Colbert, ironically, is the worst. At least Noah is doing it from the appropriate place.
I can't blame them too much for getting too political. We're in a time where politics is so absurd and difficult to ignore that it's always a plentiful well of comedic material, and those jokes are much easier made at the right than the left.
Not only that but given how polarized we've become, after the Trump era, many of these late-night shows kind of have to rely on an audience of anti-Trump viewers for the sake of ratings. Trump supporters certainly aren't going to watch them. I think Fallon (whose show fell behind most others after Trump's election, probably partly due to his infamous messing up of Trump's hair and treating him like any other celebrity guest that Fallon is notorious for brown-nosing) with this is trying to get some of those more politically-oriented viewers back.