10 billion is a good chunk, but not really substantial. I'm thinking a lot of rich people would hold liquid in a wallet like tether for privacy and security, more so than middle class people. So 10 billion isn't a lot, but If it continues to rise or if tether defaults, it would be somewhat like the 1929 crash (thats if rich people were deep into it). I heard tether has janky practices, not secure. I think that info got out in time before a lot of people would have went deep into that coin.