Waves all time high is 240726 satoshi ($48 if 1BTC $20000) so $50 in 2018 is not exaggerative at all. There will be more hype after HW support and smart contracts in my opinion.
every year we hear this "bitcoin is over" or "bitcoin is dead" etc., may be this is realy dream of banksters im sure it never will be. If we look to history we will see sameting that was early