Honestly... Lifting the one child policy beyond 2020 might be too late to raise fertility...
I think lifting the one child policy in 2015 would be the best thing to do.
Even now a days couples will unlikely have a lot of children now a days, especially if you count in the cost of living in the cities.
Lastly as many say it will be a great challenge to have graying population. It will surely be a challenge if migration of foreign races will be allowed to fill in the gap of the own native race. But if China will prefer its own native race over foreign migration. I don't think it will remain a challenge. It might be catastrophic beyond 2050.
I think lifting the one child policy in 2015 would be the best thing to do.
Even now a days couples will unlikely have a lot of children now a days, especially if you count in the cost of living in the cities.
Lastly as many say it will be a great challenge to have graying population. It will surely be a challenge if migration of foreign races will be allowed to fill in the gap of the own native race. But if China will prefer its own native race over foreign migration. I don't think it will remain a challenge. It might be catastrophic beyond 2050.