Bioware could solve concealment operative's rampant proliferation/domination by just getting rid of the "Shadow Operative Elite" passive. There is no need for it considering that the other op specs can't get it and do just fine. Furthermore a lot of other classes are losing(being forced to choose between existing) dcd's that do the EXACT same thing with a 1 min + cd. Could be replaced with lethality ops "Quickening" passive for the instant heal after a roll on a 10 sec cd. Removing the former and introducing the latter would bring a greater homogeneous unity between the specs that would be easier for players to transition between specs.
As for mercs, they are in a rough spot. Their damage is lacking comparatively to other ranged classes, but I don't think it would be justice to say "strip a dcd and give damage". Maybe something like a new passive that can be chosen at level 80. Something like boosting kolto (proposed) "Maldolorian Fervor" , Channel the Spirit of Mandalore upon dropping below 30% max health, purging all negative effects granting x% increased health and damage for 'x'seconds. All bonuses lost upon expiry.
Idk what do you guys think?