Put it thisa way:
“The field” is clammoring for a return to the 7.62x51. Also of note, in the future, there will also be a 7.62x39 variant fielded for the SCAR.
Well, maybe in SOCOM-ville, but there is no validated requirement for a general issue 762 rifle to replace the M16/M4 from CENTCOM or any other combatant command.
Again, what will be interesting with SCAR is how much draw 762 really has amongst the rank and file when they have both options - and the M4 - available.