Apart from EK/QR/EY, know any other airline that offers anything like a genuinely index-linked package? I don't want to live in the desert, but others do to get that, so fair enough. Index-linked packages are NOT the norm.
The question CX needs to ask itself is: is the package sufficient to attract enough people to join? Right now, it looks like it is, although who knows what kind of people are joining. If it's not the case in 10-15 years time, and people start leaving because they can't afford the rent/mortgage, do you really think they'll leave it there? They have a business to run. Simple supply and demand.