What about all the various credit card dongles (Square, PayPal, etc) that rely on the audio jack for output? Currently, the major players give the dongles away

What about all the various credit card dongles (Square, PayPal, etc) that rely on the audio jack for output? Currently, the major players give the dongles away for free because they're fairly cheap to manufacture. What happens when Apple does away with the headphone jack and forces a licensing fee for the new interface?