I have been geocaching since Jan 2007. I've enjoyed finding geocaches as well as benchmarks. I have numerous fizzy rounds as well as a triple Jasmer. Those are all fun challenges that make you travel, see the world, and work hard -- sometimes challenging what you may not have thought your body could do. But finding a 20, 30, 50, 70 year old benchmark that no one else has logged on the GC site is definitely more fulfilling than finding a 1/1 LPC. It's a sad day to see that Groundspeak has made this decision. Yes, the benchmarks may only be available primarily in the USA, but geocaching friends who have visited the USA have wanted to find them --- one of their goals as well as finding Jasmer caches.
My desire would be to keep benchmarks available on the GC Site. If it's a revenue matter, have a charge for the benchmark portion - $5 - $15/year perhaps. Or maybe premium members free, and non-premium with a charge. Or move them to a new website where all you can log is benchmarks, but keep the database, logs, and photos intact. The Waymarking site is not geared towards benchmarking in the same manner as the current GC site. A number of my geocaching friends who enjoy benchmarking are seriously considering dropping their memberships. That group may not be enough to impact Groundspeak's revenue, but can easily result in negative word of mouth advertising.
I hope this decision is reconsidered.