They could remove gems, but that would take away from being able to use Gem slot items from within the economy.
Making them 2-2 would probably still retain the complaints.
Currently a full set of BC epic gear can carry you to 90 within Battlegrounds.
Throw in the bursty BC vendor trinkets and off pieces for added viability.
After all the best gems are the easiest to get, for the most part.
That accessibility for all!