There is some indication of that - gas stations have seemed to be leading the push here, with "cash-only" prices, but you'll also see places with CC fees or minimums (as much as the providers try to crack down on this).
This goes through cycles every few years. We seem to be in the cash discount part of the cycle now. Then stations discover they don't like losing customers who want to pay by credit but are getting "ripped off." Admittedly apps may make things different this go-round.
