take over tether's place in its reign over stablecoins?
There's even decentralized stablecoins, if people truly care about their money, they gonna diversify their stablecoins holding to various stablecoins. not to mention there's BUSD backed by one of biggest crypto exchange which hopefully too big to go down.
Bitcoin has been here even before USDT was born. So if USDT falls, btc will still be here. But like others have said, it may significantly impact its price but I don't think btc will go down to zero. Remember in 2019, Tether lawyer admitted that they were not fully backed by USD assets, and right now, how can we tell the absolute truth that they are now fully backed? So there's always doubt about the real assets of USDT. Just be careful in holding this for long term.