I have a debit card for my personal account, a debit card for a joint account I share with my SO, a general purpose credit card and 4 store credit cards. All of which use magnetic strips and could be replaced by coin. Yes, I have to carry my ID and insurance card as well, but coin would drastically reduce the bulk of what I carry and make that minimalist wallet I ordered off kickstarter all the more useful. I think it's brilliant, even if it is a stop-gap until we get proper NFC adoption.