Reject? Reject lah!?
The short answer is, so what?
At any time without explanation, the company can exercise it's right (just as the pilot similarly can) to terminate the employment contract with three months notice or salary in lieu.
So long as there are SIA (Expat, Mauritius / or other) pilots who cost less, work more and don't politick / grumble, they are at least three notches up on the food chain.
And when the company decides to just go ahead with their plans, the Association can only make a lot of noise and nothing else. The last round they just went ahead and did as they pleased when it came to the issue of business class seats set aside for crew during their rest period. Agreement? What agreement?
They are unlikely to axe all the expats anyway. They have long been seen as a counterbalance to the locals, who can be counted on to just do the job regardless of the politics. As such they are of strategic importance and it would be stupid of the management to throw them out lock, stock and barrel.
The Association is naive to think that expats should go first. After all, there a significant number of locals who cost more, at the top of the pay scale, are just regular line captains with no further value-add, and who come to work as grumpy old men.
Today (21 May) is also the release of the National Wage Council report on, amongst other things, how seniority-based wage systems have little relevance in Singapore. This is another warning for these grumpy old locals.