Here is something more realistic, that takes into account how Bitcoin matures over time.
The ratio between the percentage gains of the two major Bitcoin bull runs (2011-2014, 2015-2017) is 4.85:1.
Applying this ratio to the 2015-2017 bull run, this would place our next high at ~80k. Which definitely sounds reasonable, as Bitcoin is no longer the $12 fringe asset it used to be.