hiwaytohell,
Agree about REX at the moment, however currently their only competition is Qlink, however as more ATRs arrive expansion into places such as Wagga, Dubbo and the like will happen and REX won't be able to compete against the big 2.
Regarding Skytrans performance, given the number of aircraft Jetgo have (including the ones on the way) there is no guarantee their performance will be any better.
Look back a few years when Tiger started. With their fleet of 5-6 aircraft they had trouble covering breakdowns and were always cancelling flights. Even Virgin has been caught short of aircraft and crews during major weather disrupts.
Country folk will only take so many delays/cancellations before they start looking for more reliable service.