It would likely only affect Gunnery Commandos and Arsenal Mercs.
I play a commando as well and I enjoy it, but I can definitely see where a slight nerf is needed. When you get to a certain level and get a particular ability where there's absolutely NO reason to use any other ability (Grav Round/Tracer Missile respectively) other than spam that one ability because it basically ignores most of the target's armor, has great secondary effects (stacking armor reduction on target/damage absorption buff on self) with no cooldown and a relatively short activation and fairly low power cost - AND does a shitload of damage... I'd say that ability needs to be looked at.
For example, last night I logged in long enough to try to do my pvp daily in the warzones on my shadow. Granted, we had a shitty uncoordinated team, but when you end the warzone with 1 kill and 4 deaths, 3 of them by the same player spamming a single attack every time... And not a single person on our team had > 10 kills, most were upside down on K2D, there's definitely a problem.
I stealthed up after about half the match knowing we weren't going to win and just watched this Merc go to town spamming Tracer Missile and nothing else. Solo kills in 4 or 5 hits, it was sad. Thing is, I know my Gunnery Commando can (and does) the same thing with Grav Round too.