We can send any amount of money to anyone, anywhere as easy sending an email, fast transaction, low fees and anonymous.
The price of bitcoin keep increasing since the first time invented by Mr. Satoshi in 2009 and has proven passed many obstacles, now it reach $700s and will rise again and again.
That is the beauty of bitcoin. Satoshi created it for the own good of people. In bitcoin, we are our own bank. There is no minimum balance in our own wallet unlike banks. Bitcoin has less fees than using banks. There are many benefits of using bitcoin It's just people are still afraid of using it or not yet showing some interests to it.
In my point of view OP is talking about bitcoin and others altcoins, not fiat currencies...
And well, bitcoin was the first one, is the father of cryptos so that's why people prefer bitcoin btw the others coins can go "bankrupt" fast and have a lot of wales.
What you said is true that other alt coins are controlled by the developer and the whales but bitcoin is independent and it is not controlled by anyone and it wont vanish any time. and most of all alt coins value are measured in bitcoins. So it is clear that Bitcoin will leave till the technology is living