I don't see how this is supposed to help.
Late-game scaling issues ultimately boil down to the opportunity cost of the unit i.e. is it worth keeping the unit around, or filling that pop with a different unit? Is it worth investing in a mainline in the early game, or saving those resources for an elite unit in the late game?
Reducing the manpower and pop costs for volks in the late game reduces their opportunity cost without substantially changing the tactical matchups.