Re-watching this from the beginning and it's even better the second time around somehow. It doesn't feel as slow as it did the first time, probably because I've seen it before but also because I can just watch one episode after another.
I'm up to season 3, but still thinking a lot about season 5. At the moment, my money is on Nacho dying, Kim being a 50/50 and Lalo surviving but probably ending up in a high security prison or something. My original thought for Kim is that she was given a new identity by the 'disappearer', but unless they shot that already it would be little bit trickier to pull off as the actor has sadly passed. Still doable though, just phonecalls / don't see the driver of the van etc.
It would make sense, due to the scene in Breaking Bad with Saul & Francesca. I assume the person he was telling Fran to call about speaking to him on his birthday is Kim.
Also, one other note about Better Call Saul for me is that almost all of the new characters are very good. I would put most of the newcomers in BCS above a lot of the recurring characters in Breaking Bad.