When I get to the point where I can't outrun a snake, I will consider the next option in dealing with them. Now, granted, I am slowing down a bit, but I figure I've still got a year or two left where I can somehow manage to get away from them.
I have been within "biting distance" of many poisonous snakes over the years. We have managed to negotiate a truce every time. I see no reason to change the terms this late in the game. Admittedly, though, if one of them decided to violate our agreement in leaving each other be, I would have to reconsider.