why do you say that?
we are currently making less resources go much further than ever before.
technology keeps doing more with less.
the only thing we consistently need more of is energy.
A dyson sphere would provide a BUNCH of energy..
...and mask the emissions of those who live in it.
Ever wonder about all of those brown dwarves?
Brown dwarves are the most common star there is...
A dyson sphere would still be most likely detectable. Maybe not with our current technology, but with future technology for sure.
what about brown dwarves?
since we don't have very much observational information about them, I do not really have an educated opinion of them.