Limits to Immigration?

According to Ben Horowitz:

An excellent constraining principle when planning your budget is the preservation of cultural cohesion. The enemy of cultural cohesion is super-fast headcount growth. Companies that grow faster than doubling their headcount annually tend to have serious cultural drift, even if they do a great job of onboarding new employees and training them.

If we apply this to immigration, we can see we must set a quota of no more than 300 million immigrants this year … and 600 million next year ….