Why would you join Virgin unless you were desperate for a job? The system is very much now against you. Let's have a look at it:
You will now join the seniority list below VARA and most likely below Tigerair as well. Only entry points on to the jet fleet are VAINZ and 777 SO. Even now it's taking guys at least 5 years to transfer from either one to yes, just an FO slot on a 737. Yay!
Think about it, the company is shrinking its fleet and now you're below VARA and most likely Tigerair as well. Like others have suggested, 10 years is not out of the question.
So there you are, living in NZ indefinitely away from home flying for an Australian carrier and you've only just realised why VAINZ has such a large attrition rate with guys next in line for a command even leaving, or; a 777 SO on yes, less money (and about to become much less) than the Flight Manager and treated us such.
Unless VA announce some "concrete" plans for expansion and actually place a significant physical order for wide body aircraft, 10 years in a substandard job just so you can then fly a 737 as an FO is not worth it.
There are many better options out there, including most likely your current job.