Can I wire the ouput and Vcc of an electret condenser microphone amplifier and get the same signal out?
I was thinking to wire Vcc with output to get rid of one wire, making
  it a 2 wire system, is this possible without losing the amplification?




It's called phantom powering and works fine for balanced stage microphones and will work OK for short runs of cable connected to an unbalanced microphone but be aware that noise will eventually become a nuisance because the unbalanced microphone.