Lots of hard forks and people wanting to have the new bitcoins (bitcoin cash, bitcoin gold, etc) for free, the fact that CME will list the BTC derivatives in ab

Lots of hard forks and people wanting to have the new bitcoins (bitcoin cash, bitcoin gold, etc) for free, the fact that CME will list the BTC derivatives in about 2 weeks, so new money are expected to enter the game. Maybe even the fact that no government can print BTC at will and that nobody can sequester your BTC account as long as they don't find your wallet. There are lots of reasons, but I don't know why now and not 2-4 years ago.