I'd be okay with the Khemist going away if it meant cheaper infantry and Special-Weapon stacking Thunderers. People don't take Skywardens because they 'd rather augment the Riggers saws, and they don't take Volleyguns on Company because they want to augment Skyhooks. People don't take Thunderers because they cannot stack the special weapons anymore, and they don't care about augmenting the rifles .
Reducing/removing the Khemist would require lower point costs for all the infantry, but I think all those warscrolls (and loadout options) all look more attractive without the potential to add an extra shot. The augmentation ability takes a lot more than it gives. Good news is that the Gunhauler is now the same cost, so an easy swap!