Clerical Decline

I recently learned that in 1965 there were almost 200,000 nuns in the United States; approximately 1 in 1,000 Americans.  Today that figure is 60,000; one of every 5,000 Americans.  The average nun in the United States is almost 70, so that decline is going to become even more precipitous.  In 1965, there were 58,000 Catholic Priests in the United States.  Today the figure is 30,000 and 50% of them are over 70.  Some people are calling this a crisis for the Catholic Church.  I regard this as a very encouraging outbreak of common sense. I have, at times, pointed out to my classmates at Notre Dame Law School, that until the last century or two, the best and the brightest of all Europe (until the reformation) and in majority Catholic Countries after that, never had children.  What are the long-term genetic consequences of centuries of selective breeding for stupidity? (Discuss amongst yourselves.)