They won’t even have to outlaw cash; they’ll just debase the currency to oblivion. From Mark E. Jeftovic at bombthrower.com:

The world is headed toward Central Bank Digital Currencies (CBDCs) and everybody knows it, even the people who don’t want them (which at the moment looks to be most people).
But the policy-makers have deigned it be so, and CBDCs provide such a compelling opportunity for surveillance and social control that they are irresistible. That the fiat currency system is in the process of imploding makes it an imperative.
My editor and researcher JonB, (give him a follow) sent me this tweet:
It was to draw my attention to the timeline for Australia going cashless, and while doing so doesn’t coincide with the launch of their CBDC, the RBA is dilligently headed there (as are nearly all central banks globally).
One area of focus in The Bitcoin Capitalist is that we track all the national CBDC deployments and the myriad supranational policies and aspirations that go into them (we call it “Eye on EvilCoin”, for the Mr. Robot fans out there).
With the tweet above, I became more intrigued by the call-to-action itself, because I see this a lot: the idea that the way to resist the CBDC is to keep using cash. This is not only wrong-headed, it’s self-defeating.