Really stubborn friend you have got there. Some people just appear not to catch certain visions and always in disbelief has they refuse to see. Good he finally joined in. He might have missed a lot by delaying for so long but better late than never.
Don't have a story yet has I have not been in the cryptospace for so long but myself have missed some opportunities that could have changed my fortunes. It is all about making smart choices this days by investing in the right project for the long term. Believe cryptocurrency will do a lot more in the future has the masses accept it.