There seeem to be two different scenarios here.
1. The intelligence in a star system may at some point be no longer
interested in increasing computational ability.
2. The other is that discount rates may colonization not
cost-effective.
On 1. The effective net values of a star system will be composed of
the values of its many components. Even if most of these components
suddenly no longer desire computation ability, some components surely
will. And some components will surely value exploration and
colonization for its own sake. Even within a group the size of this
list we have a wide variety of goals regarding our futures.
On 2. Even just looking at the goal of maximizing computation, you
need to remember that discount rates are evolutionarily endogenous.
If there are many different components with different discount rates,
the ones that come to dominate the population are the ones whose
discount rates are best tied to the feasible growth rate. If solar
system limits are hit, so growth stops, then components who value
longer and longer time scales will come to dominate, until extra-solar
colonization efforts start to look attractive.
Robin Hanson hanson@hss.caltech.edu http://hss.caltech.edu/~hanson/