It doesn't follow from an application or use case for blockchain technology that I should pay you millions of dollars for the service of having previously owned some Bitcoins. For one thing I could transact on some cheaper altcoin, or make my own. I still have to pay for hashing power and liquidity. Those guys are smart. But their business is competitive and in the long run profits will be thin. Bitcoin's dwindling supply is a clever trick, but in reality the supply of tokens with which to make blockchain transactions is growing all the time.
For another, payments infrastructure is a problem but not a huge problem. There is a ceiling on how much it's worth to solve. And the traditional banking system remains a competitor. Not to say you can't get paid for helping me with a payments problem, but orders of magnitude profit? For such an ancillary contribution of having the currency prior to me (or my customers)? Color me skeptical.