Not sure why we get all this whining about JC? It is still by far the most profitable profession out there. Demand is always lower at the end of an expansion.
People seem to be annoyed because there might be competition and they get undercut. As long as it remains highly lucrative, then ofc you will be undercut. What people are saying is they get to use all the addons and shuffle more so all their items sell to the exclusion of others.
Because there is an unlimited supply of cheap ore from bots, then the game can support unlimited shufflers who only need a few recipes to simply shuffle red gems.
Blizzard might think about:
1. Getting rid of bots and more careful regulation of large ore sellers. Would mean people were required to actually go and mine stuff or that ore which appeared on the ah was done by a gatherer and not some automated program.
2. Putting a bigger deposit down on the ah for sales i.e 20% of listed price, which would then discourage constant relisting, although there are ways round this.
3. Rebalancing gem desirability so reds were not so dominant and other colours so useless.
4. More recipes as the cut from 80 to 40 was too easy street and previousy there was much more variety in trying to sell different cuts.
Unfortunately selling stuff on the ah is dull and even duller now with all the undercutting addons. It is simply a war of attrition.