This is more true that I initially thought, Perly. However I don't think players reacting to an incoming DRK is actually the primary reason. My experience is that players are simply doing a lot of running away in general and thus accidentally escape the danger zone with the greater delay.
Also, I haven't seen any of the notable Aether DRK premade commanders on the field yet. If they turn up playing BRD I'll toll the bell for the end of the DRK meta. Although knowing their commitment and ability, they may unleash something worse.