Do we know this to be true when you look across all proof coins? I know for quite a while there were sets like the First Spouse and Commemoratives that make purchasing regular proofs difficult for most of us. Several years ago if you were a gold proof collector you would have needed a Gold Buffalo and perhaps a Reverse Proof, a Gold Eagle and perhaps a Reverse Proof, 4 Gold Spouse, and several Commemoratives just to keep up. That is a lot more than lunch money. Then there are ASE and Commemorative Silver, and normal proof sets. But when you add up all proofs being sold are they really going down?
I believe the reverse proof became popular in other countries first, perhaps England or Canada. It was a way to demonstrate minting skill and artistic skill. I believe that they will continue to be an attractive addition to each series so long as they don't overdo them. In the gold arena a reverse proof every year would begin to tax pocketbooks to the limit for many collectors.
Here is a new and interesting article on proofs from CoinWeek http://www.coinweek.com/modern-coins/why-did-the-number-of-cameo-proofs-increase-1950-1964/
Sooo. Michael, my man, seems we're getting a reverse proof set AND an enhanced uncirc. set too. Ain't 2017 grand?
irrespective of the proximity of one's wife to oneself - if he's married - his wife not only HEARS all...but KNOWS all! (smile)