Eh.
Late night isn't dying because of politics.
It's dying because like the rest of linear TV, people have more options than ever.
You used to watch late night to see movie star interviews and previews to new movies. All that is widely available online now.
Live Sports is the only thing that commands must see big viewership.
And the guys who are doing late night now have just done it way too long now. Letterman and Leno had lasting power because they weren't as overexposed before taking the chair.
Kimmel has been mainstream since man show and been doing Live since mid 2000s. Colbert Report started like 2005 when I was in high school and has been doing late show 10 years now. Fallon was doing movies and such before tonight show.
Nobody beats Craig Ferguson though. He was the best.