[Piers]

The affect of intelligent life on the universe is strictly limited to localised effects by the speed limit.

[ QUOTE ]
The moral of the story: get your stargazing in now, while the getting is good.

[/ QUOTE ].

I disagree. My judgment is that you have greatly underestimated the frequency of intelligent life, and overestimated the affect of intelligent life can have on the universe.

So assuming your correct about the Dysen Sphere thingy (big assumption) I can’t see more than 5% of stars disappearing.

Still I am guessing. Maybe if we a much large frequency of intelligence supporting stars, plus some form of creeping colonising over millions of years, you might be right. But I still don’t think so.