As long as Bitcoin and other cryptocurrencies are not regulated and formaly introduced into financial and economy system they can't help economies in any way. And until that happen s businesses will not use crypto on a massive scale.
So, cryptocurrencies can only help individuals and all othe crypto involvment in economy at any way in unregistered and unrecorded and it's actually underground economy.
It can affect the economy in unregulated way also, it provides opportunities for stabilizing your financial status. If more people will adopt this and would become financially secure, that would reduce the rate of inflation that is one of the leading problem of the world. Reduction in inflation would result into the stability of economy, I think people should adopt it to boost their economy.