Bitcoin is a clear example of the chicken and Egg riddle.  There is already about $12 billion invested into the platform of Bitcoin.  Thousands of merchants are accepting it, and it has almost gone mainstream from a "I heard about it" standpoint.  The structure is building, and thats something none of these other coins will ave.  You never heard of a major retailer accepting another coin.  That's because if they were to accept a cryptocurrency it would be BTC first, and as more and more retailers start accepting BTC it strengthens its position even more.

Either BItcoin succeeds and is easily the winner while some altcoins may be worth a decent amount, or Bitcoin fails and all altcoins will pretty much fall with it.  If Bitcoin was to fail, the confidence would be lost for all the other cryptos.  There is no way another crypto will simply surpass BTC.  it's all or nothing for the industry, and its led by Bitcoin.

Check this post in 3-4 years and I am 99.98% sure it will be correct.