The good news is that hunger strikes by the Buddhist community in Sikkim have sucessfully stopped hydroprojects in the past. However, the projects planned for Dzongu are much much larger. The government of Sikkim is not evil, and has made remarkably progressive environmental moves in the past (e.g Sikkim was one of the first states in India to ban plastic bags).
Sikkim works hard to position itself as an ecotourism/buddhist pilgrimage destination for western tourists, so getting the word out about this hunger strike may help tip the balance.