Two Frequencies
The current system is a mismatch, two frequencies for airborne traffic in the control zone - aircraft on separate frequencies unaware of whats happening on the other frequency - doesn't make for good situational awareness.
Sure have two frequencies, one for initial contact and delivery of departure/arrival instructions either prior to taxy or prior to zone entry and one frequency for all airborne traffic in the zone.
It's always a lottery as to what frequency to preselect on the Com prior to joining as the ATIS doesn't ever mention wether or not two frequencies are in use. They do it at PM and even AA states when to use 118.7 for Tower, Ground and Delivery.
ATC Training/Flight training
Fair call Slackie, BUT there is one major point of difference, the main business of flying schools and aero clubs is to train pilots - the main business of ATC is to control air traffic flow not train controllers.
CTC's Expansion
I would have thought that any increases that will result from CTC's expansion plans will result in wailing and gnashing of teeth in certain offices.