If you wanna ask me if Gelugpa has lost its effectiveness, I'd say yes, we have because at this moment, we that the Gelugs are divided and hurl accusations and insults against each other. So little Gelugpas have rise up to the occasion to, ironically, protect the Dharma protector's practice, or rather for the right to practice Dorje Shugden. If Lama Tsongkhapa is central to Gelugpa, then Dorje Shugden is the shell or armor that protects all of the followers Lama Tsongkhapa, and Buddhists in general.