So in my opinion if Bungie wanted to adjust the amount of special ammo they should have had everyone start with the normal amount of special and removed special ammo crates all together. That way people would really have to strategize as to what they want to use their 6-8 sniper/shotgun rounds on each match. After you have exhausted your special ammo it would then lead to more firefights with primary weapons which this game lacks at time.
Now I do realize that Icebreaker/Invective could break this system so that would need to be looked into (perhaps banned from those game modes). Also, I also have heard people are exploiting the fact that sidearms spawn with ammo which would be another area to address but overall I feel this would have been much more impactful.