Any target that exceeds a term of government needs to be viewed with suspicion. This smells like kicking the can down the road to where it's no longer Angela's problem.
The phase-out plan was designed and signed off by a committee which involves unions, environmental organisations, and power/mining companies. Future governments can use this fact to hold the power companies to account.
You haven't seen the union workers on friday protesting for a sensible transition. These aren't men that doubt climate change, these are men fearing about their job. If you have a house and a family to care for, change within 5 years can lead to huge political backlashes (in local elections).
Also, this was the coal commission suggesting a strategy, not the government (with plenty of old ministers though). What the government is doing with this now, we'll see
And 2038 isn't that far out in the future.