They want to and they are trying their level best. But they won't be able to achieve that. Actually the rise of Cryptos is the fall of Fiat and Fiat is the whole backbone of any government so they have every right to oppose it but sooner or later they have to embrace it instead of opposing it. I believe there will be a new system will be worked out, that will be following the crypto innovation but will give some kind of leverage to the govts over it.
I doubt everything you are saying.
if the governments want the crypto dead, they will make it nearly impossible to exchange for money.
I don't see any fall of Fiat and any rise of crypto.