I seriously doubt this. Bitcoin is like "gold range" of value compared to other currencies. The value of other coins and tokens is defined by it and I am sure that this won't be changed in the near future.
I can guess it. Today, some people state that Ethereum will become the leader. It can be because of hundreds new ICO appearing everyday! Big money!
Well yeah, but it doesn't change the fact that most people buy bitcoin to buy ethereum with bitcoin. That's why all the currencies depend on btc right now and cannot replace bitcoin.