Although there are a lot of altcoin arising even with more updated features than bitcoin, bitcoin still remain the strongest because bitcoin already has the trust of people who strongly believe what bitcoin can do and I think that's the reason why bitcoin survived a decade.
That's still count, people trust made Bitcoin the top crypto currency around the market, even there's a lots of new projects that been introduced and Making it's name and really working out fine but in the end of the day Bitcoin will still gather more interest and support from investors and traders who knows how to play well inside market, it's all about support and trust from the end users.