Why do I get the feeling that swapping Jetstar Asia with jetstar Oz is a bit like plugging a hole in a dam wall with your finger only to find another hole.
You run out of fingers but there are still leaks.
Replacing one Jetstar aircraft with another is not really going to fix anything.
At the end of the day ,if you want to maintain market share or increase it you have to give the market what IT wants not what you think it wants or deserves.