I would argue Visa and Mastercard and payment processing at large as the top priority by far. It's crazy that we've given up control as a society of the only mechanisms for electronic payments in an increasingly cashless world to unregulated private entities who continue to jack up fees as often as they can get away with. Makes everything 3-5% more expensive. Ridiculous.
Payment processors and providers are regulated around the world and in the US, if the US wanted too they could cap fees they already do to some extent just not as much as say Europe.
interchange in the US is not regulated outside the Durbin Amendment for debit interchange for large banks.
Visa and MC are way too lightly regulated when they are the gate keepers to a cashless world due to what I would consider a historical accident. No reason why these networks shouldn’t be utilities in a cashless world.