The Fox show re-runs are the big reason why AS is where it is today. MacFarlane said that Fox sold the rights to Family Guy (not license the show, flat out sold the rights to it) to AS for practically nothing. Which is why AS still has Family Guy and was involved in some sort of co-ownership with American Dad. A similar deal happened with Futurama except AS didn't buy the rights to it (I assume Groening put the kibosh on that).
Both shows were amazing and very poorly treated by the network. It was almost impossible to find a re-run on Fox.
In terms of what's actually good shit: Futurama, yes. The other two (FG, AD), not really, IMHO.
As for R&M's current fate - as much as I like this show, GOOD. FUCKING. RIDDANCE.
This show really wrote itself into a fucking corner by Season 3's end - which means under Harmon and his army of diversity hire witchbitches, we're due for more status quo / bad writing pain in Season 4.
Plus, as a side-mission, I've also recently been reading the comics - and they suck royal ass. The SJWs (inmates) really did take over (the asylum) and it shows in every fucking sense, as you further go along..... Yeah, it pretty much just might just be best for this show to conclude. Too bad there's too much money to let go of it, now, if you know where to look.
Even if Harmon loses, it'll still go on - again, if the money is there, and thanks to Hot Topic - level memorabilia, it pretty much is.
Hopefully, however - and this is a BIG IF, if Justin Roland were to gain full control, the show might get better if it were allowed to keep going at all. The Smith family (especially Jerry and Summer) might even become less shitty characters in my eyes. That would be awesome to think about. Too bad it's pretty much too late to truly turn things around with this mess that has been made.