A huge driving proponent of bitcoin is that there are only 21 million coins and the underlying implication is that there will be only that amount of units in whole to purchase/trade.
no. it is not a huge driving "proponent".
what is important is that bitcoin supply will be limited and will be limited to a reasonable number. it is not small like 1 million and it is not huge like 100 million.
and it is not the "unit" of bitcoin, the unit is 1 satoshi.
Yes, although there will be 21 million bitcoins ever generated cumulatively, you don't necessarily have to own 1 whole bitcoin to own bitcoin, correct? You can own parts of a bitcoin. You can own up to the 8th decimal point of an entire bitcoin if I am not mistaken.
So it's a fact that you can own fractions of an entire bitcoin. In fact most in the world will not be able to own an entire whole bitcoin if prices keep driving up.
It's also a fact that there will ALWAYS be someone in the world SELLING their fractions and/or whole amounts of bitcoins.
correct!
And once you hit 21 million coins, and with an assumption that no one will be selling their bitcoin, then bitcoin prices will be at halt, unable to drive prices up any further.
your assumption is wrong. and it doesn't matter if we "hit 21 million" or not.
there will always be some people who sell and some who buy and some who hold. and the balance between these 3 groups decides which way price is going. if the sells and buys are at a balance price will stay stable and if one is bigger price will move in that direction. and again it has nothing to do with 21 million limit.
Most that own today, will be selling at one point or another. There will always be a buying opportunity for bitcoin even after the 21 millions have been generated as a result and even then you can buy fractions of an entire coin, so the 21 million whole 'units' figure that is implicated is false.
this doesn't even make sense! the limit is there regardless of people buying or selling or holding!
and again as i said about people are selling and some others are buying
at all times that is how any market works.
Some clever mathematicians (John Mcafee, cough) have based their equations on the fact that there will be only 21 whole some units of bitcoin to buy without considering that an entire bitcoin can be split up and thus the quantity of units available for purchase/trade are now more than 21 million. In addition, many believe that no one will be selling their shares of the 21 million alleged whole units and that this is the only opportunity to purchase.
you are misinterpreting what people are saying for some reason!
i suggest you educate yourself about "Supply and Demand" which is a pretty basic topic and it is exactly the same with literary anything else in the world including bitcoin, gold, stocks, fiat, potato,...