Well, than we can stop blaming the sick, and wonder where the faith is, of those who blame the sick.
In other words, a classic scenario today is, if a preacher prays over the sick, and the sick don't get healed, somehow it is a lack of faith by the sick person, all while the preacher/pastor etc, who is also in the equation, gets away without blame. But if the person is healed, he, the pastor, shares and gets credit for that!
So some verses work both ways. So according to the verse, the disciples did not need the faith of the recipient, and Jesus did not blame the sick. Thanks, frog.