Re: Brown dwarves, deep future

Cool idea! Seems to me, though, that H. sapiens is currently proving
that there are a lot more ways to drive yourself extinct than by
running out of hydrogen to fuse. Your plan only works if a technological
society can maintain itself for trillions of years. What if we assume
that our descendants will at certain times revert to complete savagery?
Then maybe we're better off setting planets in orbit around gas-giants,
which in turn orbit slow-burning M-type stars. (You want to avoid
having your planet get tide-locked. I believe M-type stars tend to be
very variable and active, too -- could one be engineered to be more
stable?) Another issue is that these time scales are long compared to
the time scales of evolution. And yet another issue is that we may
have to contend with aggressive aliens.