Experts believe smartphone payments will eclipse credit cards by 2020

Even though only a little over 10% of current mobile phone owners have used a phone to make a payment, 65% of the experts that responded to the survey felt that by 2020, NFC payments would surpass cash and credit cards as the preferred payment type.
With Google Wallet already available, Isis just around the corner, and rumors that Apple is working on its own mobile payment app, it was clear that they felt that hesitations from a select few would only slow the adaptation of mobile payments, not stop it.
source: IDG