What about a hybrid? Electric-powered tail rotors, but the main rotors will continue to be driven by the turbine? No more complex drive shaft, more power to the main rotors, reduction in weight etc...
1) How is a high power generator, remote electric motor (heavy!), power regulation system (probably including huge buffer capacitors to deal with sudden load changes) less complex OR lighter than a driveshaft and a 90deg gearbox?
2) Why would such a system provide more power to the main rotor?
The electric tail rotor still needs the same power as a normal one. The method of getting it there would be way less efficient than with a simple driveshaft.
So, less power available to the MR, and more weight.