Re: 21 million BTC, is it enough?

I strongly disagree with you. There is a difference between scarcity (present or future) and a belief in an asset (value).

For now, Bitcoin is being purchased due to its value and promising future. If it comes to the turn of its scarcity, no one would tell you, it will naturally be known because it will be biting.

Don't you feel scarcity when it happens? It is as simple as that.

uhhh
I don't understand. Can't really comprehend what you talking about.
Scarcity is one of the concept that brings value. So more like scarcity is a subset of value not the other way around.
Like I said before, scarcity is already showing even if more are still being mined.
It's like how we say buy the rumor and sell the news
It's future limit still plays a role in increasing its value today.

I guess the simplest explanation with that is more people wanting to buy bitcoin there's possible more pump to happen.

You have a good hint on this, and the more and pressing the demand for it, the more the value, which might later be causing the scarcity-induced price hike. It will be insane by then, provided the demand has become bitting at the time, and not what we still see now.

I tell you, if the total supply of Bitcoin is 50 million, the price will stand at the current level, that is what @Ambatman refuses to acknowledge. So, for now, it is not about the scarcity, Bitcoin is still readily available. The natural value attributed for being an asset itself has diven Bitcoin this far.