1, bitcoin has no value, just a piece of junk number. it has no value like currency or gold, people buy it just for speculation.

2, bitcoin is unsafe and easily be stolen. If someone buy some coins for invest, it may disappear or hacked.

3,Gov will 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 btc to fund terrorism activities.   

4, Btc system is unsafe too, 51% attack will destroy it.

5, people does not need bitcoin, they can use dollars as well.

So I think btc will soon die.