It will all come down to if Bitcoin can become "Digital Gold" indeed. As written by Satoshi, it's only use is actually as a payment system. This is something which every other crypto currency can do, obviously. So it will all depend on how much value people give BTC in the long run. Will other altcoins break free from Bitcoin, ofr example? Will Bitcoin become an asset which is values as the old-timer, or mother of blockchain technology?