I believe it is a good thing, there won't be more than 21 million of bitcoins. So it is limited. For that reason it will never lose its value the way our money is losing day by day.

It's a big number of BTC to mine

A fixed supply yet can be divided infinitesimally if necessary. Bitcoin is made this way in order for it to be scarce, thus creating some form of value due to scarcity. But that doesn't mean that the 21 million hard-cap restricts new people from coming in and getting their fair share of the pie. It's considered as money, so of course they need to work in order to take home some of the precious bits, and that is if they wanted to anyway. Also, on the 7.3 billion people, I don't think the vast majority would be glad to use bitcoins even in the next 5 years seeing that the development around the network has been slow--the economy of bitcoin has been in a slump and no new businesses are wanting to do anything with bitcoin as of late.

The exact number (21 million) is arbitrary.  It's presumably just a rough estimate from satoshi of what BTC's value to users would be, and thus how many BTC needed to exist.

And the total amount of available units, which is 10^8 x 21 million or 2,100,000,000,000,000 units, appears to have been chosen in order to make it almost impossible for 1 satoshi to be worth more than one US cent was worth at that time.

Since users can just use smaller divisions if necessary, the current price of 1 BTC (which is basically 100,000,000 units) doesn't matter that much.

many are lost and will remain unrecoverable .... i have heard speculation that perhaps 2M or greater are out of circulation for good. So a final usable minting of 19M or less.

Every day more stories of forgotten pass, forgotten priv key, broken hdd's, etc.

It is a relatively low number in order to promote the value of Bitcoin. That is if fear does not control emotions and limit its possibilities. The only thing that will really stop Bitcoin is the fear of the masses.

The rest of the bitcoins are not mined already and some are alreadt lost from the early year there are many cases reported of their missing bitcoin. I read some articles that 10 million of bitcoin are in circulation tge rest are in storage of the big whale who manipulates the value.

I don't think there are any particular reason that btc got 21 million supply, but because of the limited number btc will become more valuable in the future, and if the price has become more expensive the people can buy and used bitcoin's fraction, the usage of alt coins is to balance the btc price, so when btc price is too high alt coin could be used for transaction

Remember me to poor james howell. Here say around 4 million bitcoins lost forever, so total supply 17m reached soon. i hope we'll find way to get them back