Chinese are expected to moderately expand their arsenal, but they don't need significantly more silo-based warheads for credible deterrence, they just need to increase survivability from decapitation attack. Missile sponge is very cost effective way to do that. Their road-mobile and rail-mobile DF-41 ICBM's provide already good deterrence, but putting the new DF-41s into silos just increases the variety and survivability of their ground based deterrence.