I got full gold on my mage a few weeks ago. Our server has a few teams that got full gold done, but interest in doing them beyond that seems to be nil. There's no reward for getting better times than I already have, since nobody seems to care about the leaderboard.
What I -hope- they do is make "seasons" with new rewards each round in the same way PVP seasons work, but I'm relatively doubtful they'll do this as there's so few people doing them right now.
Adding more dungeons to the system would be amazing too. Challenge mode of say, Throne of the Tides or Grim Batol would be great fun. The Cata heroics blow post-nerfs, but were rather fun when running them in mostly level 80 gear. Those dungeons and most of the WOTLK heroics would be perfect for adding a CM difficulty.
For the most part if people can't get gold in them now they won't be capable of doing it a year from now. A lot of people think players who aren't doing them "don't have time", but most of them are simply incapable of achieving good clear times. The servers where there are almost no clears beyond bronze are mostly servers where heroic raid progression is also near zero or where heroic raids are only cleared when guilds have gear from one or two tiers ahead. Since CMs scale you down regardless of gear and tier bonuses are disabled, such guilds and players will -never- be able to complete them, and they should be fine with that.
Also, I'm unsure how anyone can complain about having to spend gold on consumables to do them. I spent probably 10K gold altogether on flasks, pots and feasts when doing them, which is nothing. Deaths in CMs don't cause durability damage so there's no repair bills. QQ more.