I can only assume the high end user moto's courting either chose the galaxy nexus as their next phone, picked the bionic, rezound or RAZR up, or went with Stratosphere.
My bet is on the first option personally, many OG Droid owners don't want to give up on the stock Android experience plus want the freedom that an unencrypted bootloader provides...and are willing to give up a hardware qwerty to get it.
Kinda a shame as the D4 looks nice. I'm in the process of swapping out the Stratosphere and hopefully the D3 or 4 is an option for me.