“should we not accept 100 immigrants for one Talmid chacham”
That’s a very odd take. A non-Jewish Talmid Chochom? When he converts, we’ll admire and love him. But are we missing outsiders do the degree that we should allow such mix-ups?
He is the one who will be gaining when he joins. It is also a tremendous Kidush Hashem when someone converts (אוהב ה’ שמות גרים), but for us, does it make a difference?
Now for the caveats. Personally, I believe that potential Geirim are pushed too hard and too long. Many times, they are put off even after recognizing their sincerity. That is a very big problem. The Gemara (in Yevamos, I believe) describes it as a punishable offence to have waited to join. Why is it ok for others to make him wait? Rav Belsky ztl used to complain about this.