There is a petition over at the Remnant asking Pope Francis to change course, or if he will not, to abdicate. I was a bit shocked by the idea when I first saw it, but it is written with due respect and in a spirit of faith, and with full documentation. The authors quote St Catherine of Siena, who wrote to Gregory XI:

Since He has given you authority and you have assumed it, you should use your virtue and power: and if you are not willing to use it, it would be better for you to resign what you have assumed…

I know two priests who have signed it, both doctors of theology.