Something that I don't think has been mentioned yet: (apologies if it has!)
If VA flies to Doha, it would mean that Virgin's own, better, Velocity reward points table would apply: ie, Australia east coast to Doha for 71,700 Velocity points for a Business class flight. To fly to Doha currently on Qatar costs 104,000 Velocity points (not to mention the high carrier charges).
Conceivably, VA would move Qatar redemptions into the better redemption table (which currently includes Virgin Australia, United, and Virgin Atlantic).
If that happens, a Business Class redemption on VA/QR to Europe could be booked all from the one redemption table and would cost 127,500 Velocity points, with lower carrier charges (at least on the Australia-to-Doha leg) as well.
That, coupled with the greater availability that comes from increased flights, would be a massive win for Velocity members and would cement Velocity as the FF programme of choice for flying to Europe and back.