Maybe not so pie in the sky as there are already products like Orbit Card and Safe Dome on the market - which are not payment cards, but maybe there’s a way to integrate this technology with a standard payment card.
I cant count the amount of times I misplace my wallet, keys etc. I think this would make for a far more intriguing proposition than say a metal card.
Saying that of course, the current form factor of a card to make payment in the future is likely to dwindle and probs be replaced with a ring, watch, bracelet for example. We are already able to use our phones.