Sex robots will no more replace real women than CDs replaced vinyl records.
Maybe not the best metaphor.
Sex robots will no more replace real women than movies replaced vaudeville.
Not so good either.
Automobiles vs horses?
At least there we've got machines up against biology. But in this case the parallel may be a little too close for comfort.
I've heard it said a hundred times:
History does not repeat,
But it often rhymes