I strongly believe seatbets drastically improve security while driving, and agree on making them a default standard in every car. Yet I am not willing to bet 1 BTC on me not crashing while wearing a seatbelt, nor on me crashing while not wearing it.
I get the point, but if a hardfork happens, the wager is already in. Just keep your coins in the correct branch from your point of view, and sell coins from the other to buy more.