Price per unit matters much less than total market cap. Like Gold, there is a finite amount of Bitcoin. Bitcoin at this stage seems to be acting as digital gold. As far a history goes, Bitcoin is 9 years old and gold has been established as a means of exchange and value for thousands of years.

Considering Bitcoin rocketed from $1000 to $20k in the last year or so of its existence, it's not hard to fathom a rise to around $390k over the next few years. This will bring it to a market cap equal to gold, now if Bitcoin can sort its shit out (fees, speed, mass adoption, etc), it's easy to see how Bitcoin can get up to the million dollar mark and beyond.

But that's a big IF.