Some of their routes seem to be fairly solid
Tamworth , Dubbo , Albury and Wagga along with Goldy Rocky Townsville
I think that their biggest problems are
They are not found on the likes of Webjet
They are not really set up and well known enough for infrequent tourists
They tend to target smaller towns travelers heading to citys, which is fine, but they need to have a big lead in time as lots of pax would have booked in advance
Hub busting works well, but there is a need for affiliation with VA or QF take for example Air North Wellcamp services for an example
They tend not to launch new routes with daily services, this is important as a traveler who wishes to book with JetGo and, for example, can't get the return leg on their day of choosing, will likely just book the one stop alternative with QF or VA for both legs
JetGo would be better to look at multi-leg services, rather than origin, destination services
Example
Cairns-Maroochydore-Canberra-Hobart
Cairns-Newcastle-Hobart
Adelaide-Newcastle-Maroochydore-Townsville
Much better chances of bums on seats for 1-2 sectors rather than eg. Melbourne to Port Maq which should have continued on to Gold Coast, Rockhampton and Townsville
Look at how Brisbane Dubbo Melbourne has been doing
Even their new route Albury-Gold Coast could have been
Melbourne-Albury-Gold Coast-Rockhampton-Townsville
IMO :-)