Ok so my solution would be to have the core destroyed if the team with three bases gets 100 kills. (Or any other number that allows at least some defence) This wouldn’t reset if the farmers let the other team get a base then instantly re-take it. The kill-count-till-core-destroyed would only count while all three bases are taken by the farmers team.
No. I have to keep my crops freshly watered and protect them from pesky prey.