Hi
No you'll still get to fly a full roster you will just have no choice about what routes you fly. Now that might sound ok now, but after you've done the same route, at the same time for the tenth time that month, you might think otherwise.
In a seniority based system all the nice trips go to the people who've been there the longest, same with holiday allocations and just about anything else you might like. You'll be last in line which means you'll get the worst flying, sign-ons and routes. And I think staff travel is also senority based at QF too.
Enjoy.