Exactly. You'll never know if USDT loses its value in the future due to bankruptcy, a hack, or any other undesired event. Investing into it is like playing the "Russian Roulette". After all, stablecoins are NOT backed by the government. If you want to be safe, cash out to Fiat instead. Things don't last forever, anyways.
Once CBDCs are launched (especially the US Digital Dollar) you can say goodbye to stablecoins for good. I'd be surprised if somehow Tether manages to survive the constant pressure of the regulators. If it's still afloat, then it could live alongside CBDCs for a very long time. No one can predict the future, so lets hope for the best. Just my thoughts

This is coming, governments are not going to allow for centralized stable coins to keep on existing much longer, if they can make them disappear then a lot of traders will switch and will begin to use their CBDCs, and this means they will be able to ask them all kind of questions about the source of their funds.
And if they do not like what they hear they can easily block them and keep their coins, but for this future to come to happen independent stable coins need to be destroyed, which is why we are seeing the pressure on stable coins increasing lately.