If you haven't heard of Ethereum, check it out. It seems to be one of the leaders in blockchain platforms. Even Microsoft is working with it, along with many others.
Bitcoin, although the largest chain right now, will be a small player in an enormous field. The idea of one cryptocurrency to lead them all is not going to work. In fact, the 'currency' part is somewhat insignificant relative to what the blockchain industry will be. Every 'token' or 'currency' that represents an asset in a smart contract, or an asset such as cash, will be easily and instantly exchangeable for any other liquid asset. (i.e. U.S. Dollars). Having something like bitcoin is actually little use to us. That's not saying I think bitcoin was stupid or bad, it has done much to further the blockchain advancement.