IIRC, I think what was said was "He's (Zeke) probably going to be with us for quite a while". Either is A-OK with me - staying as a long term guest or a permanent cast member.
To engage in some speculation, I think while JP to a degree still "doesn't care" when a character dies, I think, even more than he let on, really hates at this point creating new characters, and doing away with a guest slot every arc fixes one issue - a more cohesive, solid party setup. Zeke came off as a very adaptable, team orientated player in Blades (besides being great to watch RP), so he seems like a solid pick if he was to be a permanent member.
I say one issue, because I have a feeling that JP had some input about the show in general, and he and Adam discussed other things about CoS that we'll probably hear about in the upcoming announcements.
Edit: To further toot Zeke's horn, I think he's also shown to be very dependable when it comes to being able to play /host when he's away from home, which is probably a big plus in JP's book from a content creator's standpoint.