Is bitcoin a future proof currency?
We are now in the future yes,but we cannot predict what will happen 3 or 5 years from now maybe a new coin with revolutionary features that could over shadow what bitcoin is offering to it's users now..
I doubt that there will a new coin which can move or even collapse bitcoin with all it's commodity of users only during 3 years . Bitcoin is strong crypto currency which have so many users in the whole world.
By the way just keep believe in bitcoin and join to "playing"with bitcoin, you will found a feel that can give you a proof.