I've uncovered
this factsheet, aimed at employers, but that answers the question of what will happen with the current Work to Residence streams when the new Work Visa policies take effect in 2021.
The answer is quite simple: you will need to earn 200% of the median salary and have held your Work Visa for at least 2 years to be eligible to be granted a Resident Visa based solely on your previous Work Visa.
For people that will not qualify for residence this way, applying for a Resident Visa via the Skilled Migrant Category will remain an option.