Once an expat, always an expat, unless you are young and find that being in your early 20s with jet time gives you a leg up in the selection process if you want to come home after a couple of years overseas.
Get used to the expat package, stick around for the upgrade and the years have rolled by. When the next wave of recruitment starts you may be on your 30s, and suddenly 15 years in the right seat doesn't seem so appealing, with a pay cut and very possibly a family to support.
Towards the end of your career, if you are sick of long haul and living in Asia or the Middle East, are financially secure and just want to get home then DEC may be possible with a smaller operator who would welcome your experience and know that you would stick around instead of leaving as soon as the big boys open the doors. Mine transfers or night freight in older jets could be fun with a Queensland base and the children having left home.