Soon every raid boss will be dropping only 4 gold, no matter if it's Lucifron or Deathwing itself who's being looted, if you're alone in the group that is.
Take an example!
Clear Naxxramas (10) today, you loot roughly 3000 gold from the bosses there.
Clear Naxxramas(10) when MOP is live, you loot 60 gold from the bosses there.
That doesn't even cover repair bills for some people, sadly.
More information and negative feedback can be found in the blue post:
If you disagree with the change, don't forget to reply to that thread, or create your own!
There's still time to hit the gold cap!
Because MOP is still 1-3 months away, there's still time to farm stuff! Later on, I will create a post that lists all of the raids that are a gold mine currently. In the meanwhile, click on "Instance Farming" label on the gold making categories.