In my view, the biggest threats to the US dollar's dominance as a global reserve currency are the Yuan and the proposed BRICS payment system.
But both of those are going to impact international high value and inter-governmental transactions.
For internal and inter-personal transactions, crypto will only be a threat to the dollar if the Fed and SEC allow it to be. If they focus on controlling the lives of citizens, then yes, crypto becomes a threat because anyone who doesn't want to be controlled could start using it as an alternative. If they relax, let crypto do it's own thing, and stop trying to regulate it out of existence, it could become a complementary solution and (by allowing crypto mining) could even help the dollar maintain it's importance for a while.
Thanks for sharing your opinion. 🤗