It is nothing to do with being a captain. It is because there are airline operators (Virgin is just one) and regionals in Australia that require the ATPL before a candidate is even considered for interview.
Incorrect Centaurus. They require an ATPL 'OR' a CPL with ATPL credits. So there should not be any need to change their recruitment requirements.
I've said it before, I'll say it again - the new rules with regards to ATPL's is going to have very little effect. When you need it, you're going to get it. A flight test is already in place in an operators cyclic program (for example) for candidates who do Command upgrades.
I personally don't see the issue with having to do a test. You're required to do one for a CPL etc. Why not an ATPL?
morno