You just have to look what is happening right now.
Bitcoin has so many problems with the scaling debate. Transaction fees are getting higher and higher, so the Bitcoin Community is mangling themselves.
Besides this, there are some really awesome Altcoin projects going on. They can easily figure out, which problems Bitcoin has and adopt and find a better solution for this. Bitcoin will not change, because the extremely splitted community. Its too hard for them to implement new things.
Just look at the charts:
http://coinmarketcap.com/charts/#btc-percentageThe money in the future is made in Altcoins.