I partly agree with you, because it is stupid - to take money in loan and invest it in bitcoin(at high), but advertising and playing of BIG players took part in this "investment".
But I still think that blockchain is a nice technology and we have large opportunity to develop blockchain. I really don't know, does the price come back to 20k for 1 btc, but I'm sure there could be another cryptocurrency that can do it, because as I have said - it is one of the most perspective technology in financial area.