No. I enjoyed playing with the m99 in its original IJC state, hated how TWI implemented the weapons and thought it was utterly stupid to "balance" a weapon by making it's rounds more expensive than a good part of the other weapons. Maybe we should just throw handcannons at the targets, that would hurt them too.
Also imo the m99 is the sniper rifle the sharpshooter DOESN'T need (because he doesn't need any) but the one that would be fun to use as opposed to the hunting rifle which is basically an expensive scope. HR < lar. HR < handguns. Only advantage being the scope which I don't care for at all as I rarely ads, if possible. The m99 looks like a badass sniper rifle, it sounds like a badass sniper rifle, it kicks like a badass sniper rifle and it hits like a badass sniper rifle. Everything that would make it usable again would be something I'd enjoy, although I understand that balancing it is rather hard.
The thing that bugs me most about the "just leave it" comment is that the IJC pack as a mutator was perfect, it was optional and it was great. Now they spent time and energy to implement it which caused very heated discussions and THEN you'd like to have it be another useless piece of junk that just clutters the trader interface? Remove it or balance it. Don't leave it in its current state.