Your suggestions would only affect a single guild. That is not fair. Especially since guilds can still form alliances.
Yes, we are currently over the member limit, but we didn't choose that. Maybe this is only temporary and the limit will be set to 100 again. If not, the admin team will have to find a way to adjust the actual number of guild members.
Either way, every guild has the same chance to recruit members. For English-speaking guilds this will certainly be even harder on a predominantly German-speaking server. If someone decides to stay “small”, you have to live with the consequences.
Basically, I would also like to have more exciting GvG, but that doesn't work for me by restricting the only real guild activity in the game. The number of guild members must remain at 25, the guilds must be cleaned up. Guilds as big as ours will no longer exist and there will be more guilds on the server. How that will be received if a guild is suddenly halved? I don't know.