Sorry, I want to see an increase in group size, 24 is better than 12, 48 would be awesome.
I love large scale PvP, epic fights in large groups where we can play alongside guildmates and randoms we have picked up, many of whom join the guild as a result.
Since the shrink to 12 it has got harder for randoms to get into groups, where we have multiple groups up we use guild chat, and the randoms have no access to that. Add in that numbers 11 and 12 often get dc'd and you find group size is often limited to 10.
Has it made a difference? No. Zos even say that, so I don't see how limiting it more will make a difference.
I get it, you don't like ball groups, other than those who play in them who does? I may not like them but I respect them, its not my style of play but for others it is.
So no, Zos don't know what to do, if they did they would do it.