To be honest, I'd prefer if it deleted the guest - But
kept the village. It's slightly annoying to have to see a large number of villages that I farm disappear. The overall worlds on .us are small enough as it is... Those villages mean less possible future expansion/growth and more sparsely populated areas.
I feel it would add to the world if these 'guest' villages remained - Delete the player, no problem - But allow for a barbarian village to remain in that position. Otherwise, it makes an already small world even smaller... Although it may only be a few of villages in an area... It could be a few hundred villages in the total world. I feel that extra 100-X00 villages makes it that small bit more playable.
Just my opinion on it