Maybe you have some trouble to grasp the concept of very scarce a non-inflatable currency.
Yeah, and perhaps onecoin truly is
the most expensive coin ever.

Scarcity principle doesn't apply without the proper demand.
There will be proper demand of Bitcoin regardless of it being legal or illegal in the US, I can guarantee you that.
See, this what you continue to repeat (and imply), but you have not proven it
at all.
"Growth potential" as you called it ≠ the guarantee of massive demand in the future.
And the "hard math" based on difficulty -- no possibility that bitcoin simply becomes unprofitable to mine?
But if you argue adoption you are essentially arguing that companies of all sizes, as well as people, don't want to save lots of money. I just don't see that being a possibility here.
BTC can and will save lots of money to everyone involved. That is why it will succeed. I wouldn't worry to much about thinking "Will people use it?". They will be enticed to use it
in a variety of ways. Look at the Bitcoin store that offers electronics at prices lower than Amazon. What does that make Amazon think? Other retailers?
Our worry is governments/banks pretending to be regulators. That is why we must play our hand right and not blindly say "yes" to anything that gives us acceptance. We are in a position of power as the current system looks like it might be failing...