This is certainly a possibility. It's also possible that one civilisation will attain dominance and then aestivate. It's also possible that there are no other c

This is certainly a possibility. It's also possible that one civilisation will attain dominance and then aestivate. It's also possible that there are no other civilisations within range of us (if there are other aggressive civilisations nearby why haven't they have wiped us out already?).