The above blessing does not refer to numbers in one generation but to permanence for all time. Chinese are here today but who knows about tomorow. while the promise to avraham is that the Jews will be here forever and ever. This is something only God can guarantee.
Related to this, Mark Twain observed.
”...If statistics are right, the Jews constitute but one percent of
the human race. It suggests a nebulous dim puff of stardust lost in
the blaze of the Milky way. properly, the Jew ought hardly to be heard
of, but he is heard of, has always been heard of. He is as prominent
on the planet as any other people, and his commercial importance is
extravagantly out of proportion to the smallness of his bulk. His
contributions to the world’s list of great names in literature,
science, art, music, finance, medicine, and abstruse learning are also
away out of proportion to the weakness of his numbers. He has made a
marvelous fight in this world, in all the ages; and had done it with
his hands tied behind him. He could be vain of himself, and be excused
for it.
The Egyptian, the Babylonian, and the Persian rose, filled the planet
with sound and splendor, then faded to dream-stuff and passed away;
the Greek and the Roman followed; and made a vast noise, and they are
gone; other people have sprung up and held their torch high for a
time, but it burned out, and they sit in twilight now, or have
vanished. The Jew saw them all, beat them all, and is now what he
always was, exhibiting no decadence, no infirmities of age, no
weakening of his parts, no slowing of his energies, no dulling of his
alert and aggressive mind. All things are mortal but the Jew; all
other forces pass, but he remains. What is the secret of his
immortality?”
- Mark Twain (“Concerning The Jews,” Harper’s Magazine, 1899)