Does it currently operate RPT flights? Do they have the necessary security and passenger handling facilities? I'm not familiar with the airport, but their website suggests that they don't.
If not, would they want to go there? Has anyone asked them? They may be happy doing their thing wrt corporate jets and GA
. Moving to RPT jet ops opens up a huge, expensive can of legislative worms, not to mention requirements for automated baggage handling systems, GHS contractors/equipment, check in and parking.
If an established operator like Virgin or Qantas turned up with a plan then maybe they would, but otherwise they'd have to invest a large amount of money on infrastructure upgrades (and a masssive amount of time complying with the legislative requirements) on a promise from an untested new airline.
Many people and organizations who spent money on stuff based on promises from untested new RPT airlines are still paying off the bills
, so I wouldn't blame Essendon for being a bit cautious.