Blockchain was introduced a new way to do payment transaction. A new way to make us easy to make and keep money. And bitcoin is a product of blockchain that can make future going easy.
Yeah bitcoin is a future, but I think there will be an upgrade for crypto currencies in the future.
I think there is no upgrades that will even happen to crypto's maybe the people will look for something new about crypto's but bitcoin will still remain for whatever it is now. Blockchain system of bitcoin is very amazing on how it really works. I'm pretty sure that bitcoin does what has it takes to be one of the future money.