Divide by 2, starting with October 2019, then it looks reasonable.

Perhaps.
But one issue is that bitcoin tends to be a bit more volatile, so you seem to be projecting (or perhaps hoping) for a kind of price stability that is not very much a part of current BTC price dynamics.
We have a war going on, and you are expecting "reasonable?"
Get real, Phil_S.
Otherwise gonna have to bring out batman.
