Considering we can't even get everyone to switch to cashless payment systems, much less some doohickey embedded in your brain, I don't expect this will be A Thing anytime soon. Maybe 20 years out, or later, for mainstream adoption.
We're just now getting RFID-based credit cards out there as a commonplace technology.
I'm not so sure RFID in your credit cards is such a great idea. The banks, (well here) anyway seem unwilling to turn that feature off if you don't need it and if you have had your cards stolen like I did over christmas paywave let's feral scum have a jolly time with your money...
So no I'm not sold on that idea at least.
Paywave is one of the dumbest ideas ever.