It would certainly make sense economically, and it definitely reduces liability, to have a sort of "local super-elder" who serves as a quasi-CO, rather than a traveling representative who (a) costs lots of $$$ to insure and support and (b) is a direct traceable link between the congregations and the WTS.
I'm sure the legal dept. and the accounting dept. would love such a switch.
However, it would also mean a loosening of control, which is probably the reason it has not been implemented up until now.
With the death of Jaracz, it will be interesting to see if this long-rumored potential change becaomes a reality.