Over the years, I've spent some time trying to come up with an answer to this question. Many argue that Bitcoin is a dinosaur and its position as the foremost coin is bound to be claimed by a more advanced crypto, but something people seem to forget about is that Bitcoin's code can be updated. Not easily, mind you (if the recent block size debate is any indication), but it can be done. The Bitcoin protocol is actually capable of supporting (basic) smart contracts (https://bitcoinmagazine.com/articles/yes-bitcoin-can-do-smart-contracts-and-particl-demonstrates-how/), which I think is good enough for now. I guess we'll just have to see what the future has in store for Bitcoin. Put simply, my philosophy is that BTC is and always will be the king - until it isn't.