BITCOIN is the inception of it's kind of Crypto currency lying on blockchain, numerous reasons behind & the whole world were amazed by the concept & how the world could be changed due to Blokchain. Bitcoin is the first use of it as currency. same time world realized that BTC is a currency & Payment gateway which solves most of problems in financial sector. Even a poorest can use BTC for buying some stuff for daily needs  when the concept is developed & comes in the practical level. As a asset it is adopted & supported by many experts, Tech companies, Researching institutes etc. Still ALTS cannot replace BTC as a asset with level & amount of adoption by the world.