Tbh, like many have said, the technology behind the blockchain is the future not the actual crytocurrencies themselves. Cryptocurrencies will keep rising in the short term, but eventually there will be a MASSIVE drop....perhaps even to zero. This is almost certain to occur in my opinion.

Governments have 2 tools to maintain economic stability, monetary and fiscal policy. If bitcoin was to become more important than fiat currency, then the gov loses it's monetary policy- this will NEVER happen, it is too important.

Governments don't have to outright ban cryptocurrencies, they merely have to release a state endorsed digital currency regulated by the central bank. This renders private currencies void....

Only currencies that make active uses of the blockchain technology for services eg Ethereum/Lisk will survive. Most of the growth in alt coins is sheer speculation nothing else.