well , both of them will not stop in the same time - sky maybe the first one to stop due to their NDS system also due to number of people sharing their cards and others who use card-sharing to watch it
and important thing that sky was able to stop hd channels unlike VM which uses Nagra 3 and not many cards in sharing due to extracting RSA & box key but the million dollar question is when will sky go to next move ??
regards