Bitcoin will be around for a long time if people want it to be. It doesn't have to be a transaction coin to have value. BTC is easy to buy, easy to store, and easy to sell. And the tech is bulletproof. For that reason, it may well outlast us all. Or, fade away. Who knows!

As far as use for transactions, there are a few others trying to do this. I'm certain STEEM will be one of a few cryptos that serve as transaction coins. Maybe even the dominant one. I expect Amazon and other large companies to also offer cryptocurrency. Facebook too. If there's a way for these guys to make money, they'll do it, and then we benefit from choices.

If the Facebook thing concerns you, here's a nice article that you may appreciate: http://www.nasdaq.com/article/can-facebook-fb-make-cryptocurrency-more-mainstream-cm904405. They're not saying they're going to create a crypto, but...it's Facebook, guys. They want to rule the world.