I would still be willing to take a bet at these odds, given some reasonably clear-cut definition of "attempt to secede".
I think we could probably hammer out a mutually agreeable definition but the decade time frame for a pay out makes a bet on this impractical I feel. I'm reasonably comfortable making a bet to be settled next January but a bet to be settled in 2020 doesn't seem practical through an agreement on a forum.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.