Cryptocurrency enjoys a much, much higher mindshare among humans than cryptography. I guess because it's money. And also because it's been this weird but actual bubble, not to mention countless ponzi schemes and debased ICOs and Floyd Mayweather in a private jet and whatever.
I've resigned myself to saying all the syllables and typing all the characters of "cryptography" when I discuss it because I don't think you and I are going to win this one.
What I mean is: I agree with you, but I think the crypto ship has sailed.
For what it's worth I started backpacking in the 1990s and back then "crypto" to me meant cryptosporidium, the 2nd biggest concern about drinking backcountry water (after giardia).
Crypto is ALREADY short for cryptography, as in, cryptographic-currency => crypto-currency.
You can always think of it, every time you see it, as meaning "cryptosporidium"