Btc value increased not due to scams - neither the scammers nor the scammed ever hold the stuff (that is, off an exchange in a secure wallet), but due to long term holders, to whom it will continue to be attractive until some state goes back on the gold standard, which is not happening.

EDIT:

Also, the number of people to whom btc is attractive is less important than the type of people. It may be that there is never mass adoption of Bitcoin - it is also the case that throughout history most people never had any money at all. And even though most people never had any money, sound money has been extremely valuable nonetheless because most people don't know what to do with money anyway.