Yeah, that probably won't ever be discussed heavily in the show again. There is the upcoming movie series though.
I think Andrew Lincoln definitively said he's done with the show. Although a lot can change in a few years, so maybe it could happen if the show continues running long enough for him to change his mind. Or until he gets to a point where he just needs money (which probably won't happen for a long time unless he's just really bad with money management, because iirc, his net worth is somewhere close to $20 million). But yeah, he could eventually start to miss that $650k per episode salary.