You are correct but "If the math gets cracked" trips off the tongue so easily! Cryptography is an interesting science. It is all about doing stuff that is Really really hard one way and really really easy another way.
Crypto currencies are no more a scam than the fiat you use every day. The thing about cryptos is that they only have ONE easy way to use them. Fiat, that you know and love has tons of ways it can be cheated. Ask the FED. Ask the CFPB run by Pocahontas that literally is just a way to snag free FED money and use it to support stocks. Oh… and it is ALL DIGITAL. Just like the cryptos. Fiat is cracked as you fear constantly. All the time. They just make more as it is stolen.
Everything but hard money and paper money will go away if the stuff on this board turns out to be true. Keep that in mind. Paper money is far to small in volume to support the existing economy and far too slow. Hard money (gold/silver) is WORSE as far as distribution and use. No one has any and no one knows how to use it any more.