Of course they will which is why the people that outright object to mergers at all don't like the idea. Just look at the top raid guilds and how many come from low population servers. Who's guild do you think is going to be consumed the larger successful one or the smaller one? If you merge multiple smaller servers there wont be that one dominant guild that takes from all the others. What you might see are smaller guilds merging. Either way this part has no direct impact on me so merge away. When guilds are destroyed and players quit you will know why.