Very very realistic. In fact, @suppoman yesterday showed 5 coins which would have made people millionaires from just $1000 investment if bought at the rit price and sold at peak. Theoratically 100 % correct. One of the was Verge.
I remember reading your 2018 predictions and I have my eyes on two interesting coins out of them. Waiting for the dip to maximize gains.
I wrote about why Steem will boom in 2018 and backed it up with 5 solid reasons. Please have a look.