Will there be enough bitcoins?

I read that there are only 21 000 000 bitcoins. Of these bitcoins, only 13 000 000 have been released by the system.

That Satoshi person, has a few million and he is not spending it. Lots of other bitcoin whoreders [Is that the right word] keep the bitcoins for themselves.

So only a few bitcoins are in circulation.

In Africa, their are 14 000 000 000 000 people. I each of them, has only a few satoshis, nobody else will have any coins.

How do they over come this problem? [People on other forums says by increasing the decimal value = 0.0000000000]

How does that work?