The variable power optics are there. I know a LTC who fielded MK6 optics to his GPF formation in OEF. The issue there is training, specifically using a different reticle & long range marksmanship. RDS & Magnifier is a good option as it utilizes something a Soldier is already trained on, but even then you find issues in Units where they are not zeroing them properly (issue we just saw they zero both in tandem first, so the T1 by itself will be off when the magnifier is flipped.)
Suppressors are considered special equipment, but can be procured by any Unit. Command teams just need to be briefed why they are needed - lethality, survivability is the way to do that along with hearing loss.
The M320 is designed to be used in standalone configuration. The main reason it was fielded to GPF to be attachable to the M4 FOW was because during initial testing Soldiers were bailing out of vehicles and leaving them behind at JRTC / NTC. So in lieu of leadership correcting a software problem, PEO Offices instituted a hardware fix which ultimately lessens the weapon system's capability. Most weapon systems should not be hung off the M4 as the weight and obtrusive penalties outweigh any potential gains. Far too many revert to Rifleman, a large reason is due to lack of small arms ranges that can incorporate 5.56 and 40mm concurrently. How many dudes in the Army have been on a range with an M4 and GL and were tasked with selecting which weapon to best use in various scenarios?
If it were up to me, all M320's would be in standalone configuration (and the Robocop leg stock left over from the medium velocity grenade requirement that was since stricken would be replaced with a lighter and less footprint of a design similar to the S&S Precision stock.) All M203's would be LMT M1913 rail attachment in lieu of bolting to the barrel.
Electronic round counters are not the answer. Too much money, more stuff hanging off a rail, breakage, et al. Issue a rite in the rain weapons maintenance log with each weapon system, track round counts that way, hold the individuals and leaders accountable for it and their weapon systems. We took the aviation method of tracking round counts vs. time / duration as it was a far better solution that yielded more gains.