Overall, it really doesn't matter. People will play either a) whatever they damn well feel like,

the best possible character to use against the currently broken/rediculous factions and difficulties (cough*Geth*cough), or c) both. You can't stop that, Bioware can't stop that, and EA can't stop that, as demonstrated through anti-camping methods.
Also, while Bioware does observe the info on here, most of their stats come from the actual game, so in the chance that people
aren't playing solely the Ghost/GI/Destroyer/whatever, and you've just had a lot of bad encounters, they won't change it anyways.
On a personal note, I couldn't care less if the GI/Ghost get nerfed, as I prefer my SI, QIs, and soon-to-be Drell Assassin. They're simply more fun to play. However, I do care about threads like this that, while making valid arguments, will not be respected by most BSNers.