A split can be dangerous mostly for exchanges. Loss of the whole network for days are dangerous for the whole economy and for everyone.
True. If an exchange end up accepting another chain which will later become a minority coin they can loose a lot of money. But I don't see a way to prevent it in an open economy.
Installing two different core node software, and ensuring the balance is the same on both node. If not, cancel the transaction, and throw it back on the user.
