And each and every day more companies are accepting btc and VCs are ploughing money into companies to innovate with btc. Where are the same for the other cryptos. Dont get me wrong i like cryptos as a proving ground and testing ground for things which can be built into bitcoin. Also i can mine cryptos and convert to bitcoin as bitcoin mining is now not feasible for the home user.
bitcoin has massive 1st mover advantage, its like TCPIP in the early days of the internet, it wasnt perfect and we could never imagine it transporting video/audio but it gained ground and soon enough it stopped being developed as it was seen as "good enough", innovation after that happened with HTTP/skype/NAT plus lots more.
just my 2 pennies