Im thinking like an micro chip implanted in our body. This system is not out of the picture because how we discover things every year, it is not impossible that in the future this things may happen and it will boom like btc.
Yes...it will surely happen, just i personally think it will take ages for a payment chip to be implanted in the body!...so many religious leaders and bodies will fight it...let us be sincere too...we probably may not need it since bitcoin and crypto currencies works well....anyway no one can accurately predict the future!