Yes....

HODL and bought.  NOT  a bad idea.

You can make a trajectory, yourself.  If you started dollar cost average buying in bitcoin on a weekly basis, starting at $19,666 in mid December 2017, you would be quite well in profits today, and you would have accumulated a decent amount of BTC depending on the amount of your weekly purchases...  Of course, those able to do $1k per week would be in a much better absolute position than those buying $5 per week, yet the percentage of profitability would be the same so long as the weekly BTC buy amounts were kept consistent through that time and relative to the different budgets. 

Of course, in the real world, the weekly financial abilities of many people would likely fluctuate over more than a year and a half (cash flow, expenses, etc), so there could be some weeks in the real application, in which personal circumstances caused more or less financial abilities to change the weekly BTC buying amounts.