1, bitcoin has no value, just a piece of junk number. it has no value like shinny rocks and fancy paper.
2, People are unsafe and easily be stolen. If someone buy some coins for invest, they may lose it or it may get stolen.
3,Gov can't ban it, because it is anonymous and can not be controlled. People can use btc buy illegal goods like drugs and guns, and may not pay tax. Or terrorists will use dollars to fund terrorism activities.
4, Fiat system is unsafe too, many kinds of attack will destroy it.
5, people need bitcoin, many people can't use dollars as well.
So I think btc can't soon die.
I edited it for you.
