I'd be interested to see if any content providers actually make use of this; it seems to be missing certain technical requirements they claimed their partners required during the EME design phase. (In particular, a secure hardware video path and robust node-locking support. This design doesn't appear to actually be able to lock content playback to particular hardware at all if anyone makes even the most trivial attempt to bypass it.)
The history of SDMI vs. iTunes and AACS vs. Windows XP has taught me that DRM "requirements" are just the opening position in a negotiation. Apparently Mozilla doesn't have enough leverage to get rid of DRM completely but they have enough to water it down a bit.
Possibly, but they've already managed to get the W3C and several of the other big browser vendors to agree to meet those requirements, which gives them some pretty strong leverage.
