You haven't given any compelling reasons as to why 50/50 won't work, and the court doesn't buy into the argument that 'children, especially young children, need a stable place to stay most nights until they are older and can understand'. If both you and the father have stable homes, with a bedroom for the child, clothes, possessions and routines, the child will have all the stability he/she needs, provided the parents can co-parent well enough to not expose the child to family violence.
The court has granted equal time orders for children as young as two years of age, and nearly all of the Queensland judges take a progressive view of parenting matters such that a child's time with each parent is more meaningful and valuable to a child than one parent's perception about what constitutes routine. One judge even said that seeing the non-resident parent is no less an important routine than going to school every day.
So will he get 50/50? I would say that in Queensland, it's extremely likely that he will, simply because you haven't pitched any reason as to why it won't work, other than 'children need one stable home'. My husband's ex-wife made the same argument to our Queensland judge in regard to their daughter who was four years of age at the time. We ended up with 50/50.
In a practical sense, 50/50 can work extremely well. My stepdaughter, who is now five, has responded far better to the week-about arrangement than she ever did to alternate weekends and one overnight a week. To her, the previous arrangement would have felt scattered because sometimes it was three days before she saw dad for three nights, and other times it was seven days before she saw dad for one night. She didn't sleep well, was extremely clingy at changeovers, and struggled to settle into household routines because she would be gone again by the time she remembered what those routines were.
Now, she knows exactly which day she goes to dad's and which day she goes back to mum's because it's the same day every week. She transitions well, sleeps through the night, remembers household routines and knows that mummy's house has some different rules to daddy's house.
The co-parenting relationship is still rife with conflict, too, but still, this routine works better for my stepdaughter than it ever did before.
So why not try 50/50 and see how it goes?