What could Repleace F111 of RAAF?????

Many posts have been maid about RAAF upgrade of F/A-18 and F111. But for the F/A18 there are few potentila contenders in F22 and typhoon/Raphaele or even suMK or 35..(how does the Greepen measure up??). However nobdy hasnt nominate the possible F111 repleacement.Mayby becouse F111 has no suitable replecement that could significantly be improvement on it with ratio to the cost.
The aircraft that repleaces f111 will have to have Extreamly long range,good manuverability and reliability, large payload capacity and be easy to mainteain as well as survive some harsh conditions of Ocean/Desert/Rains mixtures that north of OZ is famous for. So is there a suitable repleacemet that would bring better cappability to RAAF siggnificant enough to be worth the cost??