When you have nothing to trade but trust and hope, people who take advantage of trust and hope are always massively rewarded.
Occasionally someone crosses the wrong people and jail time ensues, but if you're politically adept enough to avoid that - at least until you die and/or disappear - no career pays as well as financial fraud.
If traders begin to lose faith in Tether, wouldn't they sell Tether and buy BTC, ETH, XRP, BCH, LTC, EOS etc.?
So wouldn't that cause the USDT price to decline to $0.97, $0.95, $0.90, $0.75, etc.?
And at the same time the demand for BTC, ETH, XRP, BCH, LTC, EOS would cause their prices to rise, wouldn't it?
I suppose at some point, after the $3B of Tether is liquidated, people could lose confidence in the entire market, but until that happens wouldn't cryptocurrency prices increase rather than decrease?
These will be exacerbated by exchanges which have been run in bad faith and which do not have either the cryptocurrency or fiat reserves they claim (see Quadriga CX for a recent example).
Either way, it's going to be interesting to watch.