I actually think its a good start, not sure why the resistance if any to roll it out as it works elsewhere just fine.
Regarding missing calls etc, well I've missed them, got confused, taken the wrong one, all because the call-sign was similar and I was tired, or some halfwit transmitted over the controller, or half a dozen other reasons.
As long as we have similar call-signs at similar times e.g. 16/161 50/501 then its going to cause problems.
Like I said, its a good start from my perspective.