EWL,
As you say, when DJ pax can through check over two or more sectors without having to collect their bags and check-in again at the transit port(s), as QF and AN pax can, Virgin Blue will have taken a giant step toward being more customer friendly. Who wants to see a message like this? "Note: If you plan on booking a follow-on flight, for example Townsville to Brisbane, then Brisbane to Sydney, please allow a minimum of 90 minutes between flight arrival and next take off"
The Sabre deal looks to be all about better distribution to agents for more sales revenue. I may be wrong, but my money is on the deal not including better domestic check-in options. International to domestic? Ha!
Cheers