A chance? It's an absolute certainty.
Not only most exchanges have only a USDT:BTC pair and not a USD:BTC pair, but if you look at recent (~1.5 years) sudden spikes in BTC price, they correspond almost always to a new supply of USDT being released by Tether.
The only upward momentum Bitcoin has had since the last ATH has been due to Tether printing money, so it's safe to say that not only it's pumping it, but it's probably contributing 80%+ of its value.
If Tether dies, it's the end of cryptocurrency, period.