I think the fact that years ago, everyone knows that solar energy requires massive amount of silver and yet silver failed to stage even a meaningful rally is quite bearish.  Even China, which is on Silver Standard for a millennium and was one of the largest silver producer in the world (still is), doesn't care about silver.  It just means that silver has been demonetized.  A study on why something would be monetized (like bitcoin) or demonetized (like silver) is an interesting topic in itself.  But now days, I just give away those silver maples/eagles as souvenirs.  Pretty much no one has a clue on how much these lovely coins are worth.

As for Dyson Sphere, I suspect that if they are ever built, they would be for powering bitcoin hashing rather than synthesizing silver at the rate we are going with hashrate.