Would a merge change the basic elements of the game, meaning Heroic and Quest bosses? No.
The only difference would be PvP and Guild Wars. GWs are terribly prone to bugs and to be honest I would rather that was fixed before any complications such as mergers.
As for WBs, it may seem depressing having less than 10 participants, but you all get a top 10 reward. It would be more of a problem if you were unable in taking Cerberus/Baal down.
Mergers aren't necessarily a fix for the bits of the game you find boring. Evony is a totally different game entirely where high activity makes the game interesting. Here there are different events ou can choose to participate in or not. Try looking at it three dimensionally instead of two.
