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It should remain the same, at least up until 4.2. Why 4.2? Well, 4.2 brings a new raid out, meaning that the current content becomes easy/outdated or what many guilds call "farm" mode. The current content will be more of a " Hey can I get my alt in there for some easy gear? " - It's going to be almost like doing Naxxramas in Ulduar gear, which is makes it much easier.
If you're doing old content using new, better & higher tier gear, 80% of it is going to be disenchanted and either put into the Guild bank for the guild to use for their enchants or listed at the Auction house and sold for gold for the Guild. Either way, I expect Maelstrom Crystals to drop in price due to this. Most people will not need the gear out of here, especially if they'll have gear from the Firelands Raids that is going to be released with patch 4.2
If you're looking for ways to obtain Maelstrom Crystals, I did an article not long ago on how to obtain them, you can really craft these using very cost effective methods once you get started. It's an excellent way to make gold, especially if you meet all the requirements to use the engineering method