Which phonemes? I hope you mean to standardize spelling around deep West-Texas hybridized Chicano English, and not some atypical and well-nigh unintelligible coastal patois. Proper English contracts, drawls, and sprangs!
As people stop having kids, our economy will begin to depend on immigration. We need to make America the easy choice.
How exactly do we benefit from other people occupying our old territory after we've died out?
But that describes all of zero people.
That's a multi-faceted problem too. You need young workers paying into social security, you need an economy and marketplace that makes fixed income tractable, you need doctors and all other sorts of workers.
We want to avoid becoming Japan.