Probably they'll tell you where you can stick your notions.
I suppose we may differ on this but I don't really view that as a negative. I don't think there's a pool of "potential people" from which we draw when making a new person. An infinite number of beings don't exist, and won't. I actually would love to see more work on the nature of consciousness and the self, and what exactly gives a new foetus or baby its awareness of the fact that it exists.
And yet I'm not entirely consistent internally because even though "I want someone to hang out with when I'm old" is part of the reason kids sound fun, most of it is "bringing a new being capable of experience joy into the universe", so I guess I sort of agree, in a roundabout sense.
Eh, if anyone should have kids, it should be the financially well off and educated people.
Remember that your logic isnt going to stop impoverished people from having 4 kids and welfare.
When you frame things that way, the answer for parents who are considering another child is pretty much always to give the child the gift of life. In the developed world, at least.