Well considering how previous expansions have gone for WoW I wouldn't be surprised to see yet more secondary stats disappear. For me master isn't much of an issue but the whole hit/expertise seems rather messed up. Typically you struggle to get these to the correct level in first tier of raiding in xpac but by time you get to the last tier you are swimming in the stuff and it's just useless. I'm betting that hit and expertise are up for some modification next expansion (either dropped merged or staggered so a new tier requires a higher amount)