Jerry, while I agree that Steem is going to be more valuable in the future, don't put all your eggs on the same basket. You will never know if some government someday, crack down on bitcurrency overnight. They could literally raid most bitcoin exchange markets in the US if they want, and shut it down. Furthermore, the first steps have been given by banning it in China (which means, china can now arrest anyone using it or any wallet or provider).
In terms of quantum computers, China is further ahead of the US for some time... ex: https://www.theverge.com/2017/6/15/15808436/china-satellite-quantum-network-encryption-entanglement-micius
so they do have the capability if they "really" want to crack down on this.
My guess is that criptocurrency will be left alone until it becomes a real problem, so meanwhile we should profit with it.