All the previous comments are spot on.
One of the company's claims for EBA 7 was for the 767 to transfer to the shorthaul award. The problem I have with that (in addition to the good points mentioned previously) is that the 767 network - as it currently stands - could not generate sufficiently dense patterns to achieve high daily stick hours, and therefore adequate days off. The 73 doesn't have this problem due to the long sectors in its flying program (plenty of Perth returns, etc).
A quick look at my roster, comprised mainly of domestic flying, would show the number of sectors that are routinely downgraded (sorry!!) to 737. If the company does this on a regular basis to optimise capacity - which makes perfect commercial sense - then without MDC then we will lose financially.