My bet is zero chance of the ER's to be gone by 2020. Think back to the Classic and how long they hung around, so Zero chance.
But it looks good on paper to the market stating that they are getting rid of those expensive pesky gas guzzlers.
This morning Sky Business were talking oil to potentially spike through $100per barrel by years end so if this becomes reality QF have been smart pre-empting the market by this news. If the oil price doesn't come to fruition then they lose nothing and can potentially extend the ER's life expectancy.
Sometimes things aren't always black and white.