Have to many credit cards? Do you have to carry around a massive wallet bursting at the seems? Your problems will soon be solved. Coin has created a product that is the solution to this problem, “Only Coin” is essentially a smart card, like a smart phone- it has the capability to basically do anything- but in regards to the world of credit cards. 
It saves all your individual credit card information and allows you to have unlimited amounts of cards, all synced into one. I feel that even though the product is ingenious, it will have trouble-gaining traction- due to the questions of security alone. The company needs to do a better job of mass marketing its product and making sure that it answers questions regarding security. Even though the company is in early stages of development, it has done little to market the product itself- everyone is looking for something to solve the problem of too many credit cards, thus this product could be huge if it gained more public support.
This could be the product to start a snowball effect of other technologies that incorporate the null need for actual credit cards- however without proper marketing to the masses to gain recognition that the product even exists further than crowd funding efforts. The product will fall short of its huge potential to capture the entire new market of card-less wallets. On a different note, the company in my opinion has done well on the promotion side of things- setting up a pre-order system which offers the coin at half price, in the means to fund future production- however the underlying problem still exists, nobody really knows that the product exists.
Sources:
http://24.media.tumblr.com/dfb7409cf5a9f23292474846ab024c77/tumblr_mw9pv9ivXl1qzmturo1_500.png
http://www.forbes.com/sites/natalierobehmed/2013/11/14/coin-tries-to-make-credit-cards-history/