If they put a cap on flat damage added then we will be gimped for future expansion.... Since we are all hitting that cap already if they put new levels, buffs etc in it will add nothing to our damage.  Rangers and other melee classes that do not have the multiple effects and do not cap out on the flat damage added will still benefit from the new buffs.

What they should do is fix the "bug" and give us higher damage weapons to give us higher sustained DPS, and forget the cap.
 
For rangers they already have axes that top at 250+ damage from outside APW.  Our highest damage is the crafted fistwrap at 152 damage.

My guess is that the devs arent even thinking about expansions/content since they've had their hands so full of bugs since the games release.