I find Dominators far more useful endgame than controllers but do agree the game mode is mostly DPS more DPS and side of DPS. That being said there are ways to make CC more beneficial that already exist in game. For example.
Blaster secondaries have a power called Shinobi, shinobi allows blasters to crit from stealth.
This means its possible for other AT's to crit besides stalkers and scrappers.
In olden times held/slept foes crit'd far more often than not. Lets bring that back. But make it for all teammates.
yeah, yeah power creep this power creep that.
Lets face facts if we want the CC AT's to be more viable its either buff them in some way or nerf others.
Nobody wants a nerf. So lets make the CC AT's more attractive indirectly. The crit chance doesn't have to be high 10-15% is more than enough.
Another option is give foes toggles. Toggles for Def, Toggles for Resist. Toggles make foes tougher. unless u bring a CC.
CC removes toggles making enemies easier to defeat.