Bitcoin will be the least of the problems when quantum computers make secure transactions on the Interwebs impossible.
Eventually AI will figure out how to take down the entire Internet.
Then we will be well and truly effed.
Meanwhile, we'll do a modest rollback on blockchains, release quantum-resistant algorithms, and be back up faster than anything else will be. And that's a worst case scenario where we are caught off guard.
Thank you!
My immediate reaction was “This would affect a *LOT* more that cryptocurrencies!”