Interesting thoughts. I also haven't finished the fun sequence, so this may be malformed. The way I see it is this: You can explore and modify your environment for fun and profit (socializing counts here too), and you can modify your goals to get more fun and profit without changing your knowledge.

Future minds may simply have a "wirehead suicide contingency" they choose to abide by, by which, upon very, very strong evidence that they can have no more fun with their current goals, they could simply wirehead themselves. Plan it so that the value of just being alive and experiencing the slow end of the world goes up as other sources of fun diminish. (And leave in there a huge reward for discovering that you are wrong, just not motive to seek it out irrationally).

You would need a threshold of probability that life is going to suck forever from here on out, only after which the contingency was initiated.