So here's the deal with Cable Cards and Comcast.

The good news is that Comcast has decided to stop deploying EPON pretty much everywhere due to issues with Community security cameras. So, for fiber neighborhoods RFoG is what you will see going forward. RFoG supports cable cards.

The bad news is that Comcast is intent on switching to IP channel delivery over the next several years, and once an area or neighborhood is all IP, Comcast won't be required to use cable cards any longer.