The word species doesn’t mean what you seem to think it means
I do, but not 100% sure that you do, however.
one major characteristic: an inability to produce fertile offspring from mating [when it is even possible] with a representative of another species.
A few CRSPR mods and this could be accomplished.
Even without/before this: imagine parental pressure on a child who wants to marry the "unmodded" individual.
Such societal restrictions (on a top of even small CRSPR mods) might result in eventual separation of Homo sapiens into subspecies.
We are not resistant to evolutionary forces based on sociology (even without programming in a complete biological distinction).
That is, of course, if CRSPR will be applied on a large enough scale.
Unfortunately, I don't see how it would not happen within relatively short time frame since moneyed classes would be in favor, presumably.
