What programmes that have been discontinued do you miss? I miss Firefly and the Big Bang Theory. I've just finished reading 3 Firefly books and as libraries are closed I'll need to find some more to download to read.
I miss Cold Case. Always good episodes, and the amount of varied music they used during flashbacks and such, I now listen to a bit more variety as a result
Monk. Had a great ending and an even greater run, but I have a lot of nostalgia for it.
More recently, Arrow just ended and even though that's been an absolute trainwreck for years now, I stuck with it til the end and I'm a fan of the Arrowverse in general and it was really sad to say goodbye to that.