Today Bitcoin largely provides an alternative store of value. Even if all the proposed upgrades were to happen it's still orders of magnitude from being capable of processing the number of transactions that say Mastercard does on a per second basis.
There are other existing and future crypto currencies that will address those needs. I don't buy into the argument that traditional currency has been around for a long time so always will be. How many arrows do we use today? We don't because we have better methods of hunting or whatever.
Bitcoin is the gold of the crypto currency world, an established recognised store of value that has the penetration, adoption and liquidity that you want if you want to put something aside. Although it's increasing in price right now while conventional markets are doing well, it's key attraction (like gold) is that it's outside the conventional financial system and so will likely rise in value during times of crisis. Again this points to it's store of value attributes more than it's attractiveness as a daily means of exchange.
Cheers,
Robert
CEO
CloudSigma