Is national existence of Sri Lanka threatened?

Sri Lanka is an island situated in the south of India spanning 65,610 k.m. The composition of the population is 74.9% Sinhala, 11.2.% Sri Lankan Tamils, 9.2% Sri Lankan Muslims, 4.2% Tamils of Indian origin and 0.5% other communities. India whose population consists of more than I billion, and is fifty times bigger than Sri Lanka,