Underestimate blockchain at your peril

What do you mean, "good luck"? Get an account at a reasonable broker, send coins there, sell them, transfer $$$ to own bank account. That's less work (and cheaper, even including transaction cost) than opening a non-$-based account at a bank and getting the money converted into dollars.

Yes, bitcoin transaction cost are insane at the moment, but that's only a problem if you want to get the transfer included in the next block or two. If you're willing to wait, reduce them.