The Barbarian Village is essentially a training tool - and a good one at that. However, it only trains for one-on-one combats, not ones where multiple people are fighting together. So how about letting the Barbarian Village do that? After the BV is defeated at level 50, let island-mates form a virtual alliance (who are often in the same alliance anyway) to fight it at even higher levels. This will allow people to learn how to manage in-fight build queues, how to co-operate with allies, how to leave a fight going overnight, and so on. For retaliations, the BV would only attack those that attack it.
Agree very much to this!