(from the other post) The problem isn't a growing tax base - because that's the awesome reason for immigration - but people living longer.
So either start murdering blue-hairs or find a better solution than cutting off the feet to improve dancing.
(Additionally)
Let's quit the bungalow ponzi scheme, please, and grow proper modern density so we can preserve land for agrifood and parks and wildlife. We've already over-sprawled and need to claw some back, just because we're still addicted to hoarded land for dedicated lawn space like we're landed gentry.