IMO that's not too unreasonable. There's a reason shooting 3-5 rounds is the standard IRL, when just one is often enough. The issue, I think, is two fold;
Firstly, the ADS spread/bloom is much too bad on many guns, especially when combined for some reason with heavy recoil. Just do heavy recoil, more than we have now in fact, and leave the ADS accuracy at a fixed number, or else make the bloom very minimal.
More importantly for the TTK discussion, the animations across the board need to be slowed down. ADS speed, reload speed, some rates of fire, etc. Combine this with tighter bloom and higher accuracy and it'll push the engagement distances out because people will actually be able to land solid hits at farther ranges with something other than a sniper rifle or the ultimax.