system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect] How long would it take for the Asari to be the only species in the milky way?

So while the asari can breed with themselves, but due to genetic problems prefer to use other sapient species, of which the result is always an asari. All species find them attractive (in general, doesn't override sexuality) and they can live at least a thousand years and can have children from their late maiden years through Matriarch.

Now, the ability to choose to be pregnant (if I remember correctly) does cut into the time, but eventually the asari would have a lot less species to use this way. Assuming the reapers will never show up... how long would it take for the asari to be the only race in the galaxy?

I know it's gonna take a while. And I am 90% sure that the asari can think of population control methods and aren't out to do this.
gpt
Never.  The Asari having kids is not stopping the other species from doing so.  The Asari are also all female so theoretically their growth rate does not change weather they reproduce with themselves or other species.  Even assuming only monogamous relationships, Asari reproducing with other species is only going to cut down on other species growth rate slightly.  It won't make them go away.  


That's not even factoring in the Krogran who alone if cured would have no trouble whatsoever even if the vast majority of them mated with Asari.