The way I see it is this:
1. Bitcoin is practically guaranteed (math, science and all) to reach 6 digits and beyond. $1M/BTC is a perfectly normal and expected (actually inevitable) price level. Bitcoin has to reach $1M/BTC, or else it won't be able to take the position and role it's been designed to take (i.e., as the primary store of value of the world).
$1M/BTC within the next 10 years.
$5M~$10M/BTC within the next 20 years (or sooner).
$50M/BTC within the next 30 years (or sooner).
$100M/BTC within the next 50 years (more or less before the end of the century.)