I think that Bitcoin will alway be above all other cryptocurrencies. Bitcoin is first cryptocurrency and that gives it a lot. It broke the ice and showed people what cryptocurrency could be or become. Also if it was not the best, it wouldn't have the highest price. Maybe in time it will lose to some other or new crypto, but for now its first.
Yes for now bitcoin is the unstoppable cryptocurrency among all cryptocurrencies. Many people is using bitcoin and a lot of people is now investing with bitcoin. The highest price of bitcoin is one proof that bitcoin is really the best.