I would expect the Crypto Market Cap would be in the $1 to $2 trillion range at the end of 2018. If we get to $10 trillion it will probably occur by 2020 as crypto mainstream adoption really takes off.
Don't get me wrong I want $50 steem ASAP and will work on creating better content and encouraging others to sign up. At that price us early adopters will have such amazing opportunities to lead the lives of our dreams. I for one will be very selective on what paid work I choose to take on.
Cheers to your health and wealth.