It is exaggerated, but never say never. After 20k will be touched again, 74k is just one step away, really (you have to visualize an exponential graph).
Of course, going 10x more is way more difficult and I think that the upper limit is exaggerated... for the next market cycle, that is.
2013 high $1.2k > 2017 high $19.5k = +4 doublings.
2017 high $19.5k > 20XX high $78k = 2 doublings.
If we assume that every bull run from now on will be less extreme than the previous one, $78k would statistically be an easy target. Less extreme up swings will lead to less extreme down swings the more liquid and institutionalized this market becomes.
More paper coins will definitely damp the demand during the next bull run. $50k has been my target far before the price took a dive under its major support last year. Everything above is a sweet bonus.