I know this wont fix the main problem, blob guilds will just run 2-3 squads, but at least it will make coordination harder for blobs while not punishing groups that run smaller.
Step by step try to lower whole number meta.
The game becomes so much more fun when fights are on a smaller scale, rather then a lagfest of 50v50v50 squads.....
Just to clarify.
Im not saying this is a all-in-all solution that will solve blobbing once and for all.
Im just suggesting something minor that could help discourage blobbing (by making it harder to coordinate + share boons/heals between squads) and empower smaller groups.