Here's an interesting write-up pondering potential future media mergers:
https://www.cnbc.com/2021/05/29/media-mergers-whos-next-.html
The last one proposed, Disney+AMC, is the least likely IMO (and in the author's estimation as well). Disney is huge already and shouldn't be allowed any further acquisitions. And I can't really see how buying AMC would do much for Disney overall anyhow. It might help Hulu a bit but I'm not convinced that the long-term fate of Hulu isn't to simply be absorbed into Disney+ as an adult-skewing content hub much like Star in the European version of Disney+ now.
If Comcast decides to hold onto NBCU and try to make Peacock a global streaming powerhouse without merging with ViacomCBS (or WarnerDiscovery), then they should try to acquire not just Lionsgate/Starz, as the article suggests, but also AMC Networks. And maybe the privately held media arm of Hallmark too. Because they'll need all the content they can get to scale up and compete.
The second proposed tie-up in the article, WarnerDiscovery+ViacomCBS, is an interesting one. It would give them two broadcast nets, CBS and The CW (which is currently jointly owned by those two separate companies). CBS News could be merged into CNN. (Imagine seeing the CBS eye icon as part of the CNN logo. Perhaps the CNN acronym would come to stand for "CBS News Network" instead of "Cable News Network".) I suppose Showtime would just be absorbed into HBO Max, with its subscriber base converted over. And for that matter, I guess Paramount+ would be absorbed into HBO Max too. Throw in all that Discovery+ content and, man, what a content bundle! Pluto TV might live on as the company's free ad-supported service.