The number of people clearing normal MSV at this point is miniscule, maybe 100K. Every last one of them could quit and it would be a blip.
Blizzard's problem isn't risking catering to the "bottom denominator". They've excluded the great majority of the player population from normal (and beyond) raids entirely.
As for DS... are you saying that if it had been harder, they'd have lost fewer people? That makes absolutely no sense to me.