In the end when most vehicles are electric, I wonder if manufacturers will continue making niche "mechanical" cars for motoring enthusiasts, not unlike how mechanical watches survive to this day even with digital and more accurate ways to keep time.
An alternative would be a system like M-Pesa. It's based on your personal phone line using the SIM toolkit, though there's also an app. Transactions can only be carried out on the phone with the SIM installed though.
It's great for personal transfers, and many in Kenya already use it to pay sex workers (usually cam girls selling nudes).
Corporates can have numbers (called paybill) where payments are made, though they are vulnerable to government interference. Safaricom (the network carrier running the M-Pesa platform) has already been ordered to shut down accounts belonging to betting firms. But for personal transactions, regulation is hard since nobody can tell why you sent a certain person money.
M-Pesa has never quite gained traction outside Kenya though.