My conclusion
Why is this a problem though? People trade fiat for other valuable assets like gold as well. It's their choice, and there's zero problems with it.
Could it be possible to get bitcoin a value if not because of Fiat currency?
Could fiat currency will have no value without bitcoin? (Honestly fiat currency has value with or without bitcoin)
Yes. Gold was valuable back then even without fiat currencies. It's just a lot easier to accurately trace asset values in general with fiat currency.
As for your arguments:
* "You can have bitcoin but if it is not being tradable to fiat currency then your bitcoin has no value at all."
- Without fiat assets like bitcoin and gold will still have value. It's just going to be more difficult to find out their price.
* "You need to buy bitcoin with fiat currency without fiat currency you can't have bitcoin"
- You can earn bitcoin without fiat, and a lot of us here are doing it, along with some people worldwide. It's simply not just a lot of people because bitcoin is freakin 11 years old. We need time for it to grow.
* when you buy bitcoin you have to pay services like in those banks and when you like to convert bitcoin to fiat and withdraw it to a banks then you will then again to pay the service of the bank. You need also to pay the bitcoin transaction fee. So fees are everywhere from those banks to bitcoin network deducted by the miners.
- Same answer to previous question. As for fees, developers are working hard to make fees lower and to make retail transactions near fee-less(lookup Lightning Network).