Downloadable CA is a returning topic for the FCC: the regulator in the USA. It has recently revived discussions in the form of a new committee: DSTAC (Downloadable Security Technology Advisory Committee).
The article in the link below provides a glimpse on the growing complexity of media distribution, rights and the consequences for protection technologies that DSTAC is facing. Given the impetus of key participants to make DSTAC a success you may want to follow this from some distance.
In Europe there is an initiative ongoing without direct regulatory involvement called ECI (Embedded Common Interface). Maybe Europe can make a success where the US failed (like with Cablecard and CI+).