Might sound like a far fetched concept, but I wouldn't be surprised if after the fallout from this it forms part of the ticketing process, perhaps Etihad or the respective airline will have to pay the UAE authorities a fee which may or may not be passed on to the passenger that purchases non-Muslim passengers a liquor license.
Goodness me, does this sound like another money making exercise by the local authorities to rip expats of even more....well yes, maybe I shouldn't have suggested it!