Correct me if I am wrong,
* You can have bitcoin but if it is not being tradable to fiat currency then your bitcoin has no value at all.
* You need to buy bitcoin with fiat currency without fiat currency you can't have bitcoin
* Wrong, even if Bitcoin somehow is not tradable to Fiat, it still could be used as a payment method in return for goods or services.
* Again, You can own Bitcoin without having to exchange your national currency(Fiat) for it, buy selling services and products and accepting Bitcoin only or as an alternative payment method for your business or whatever organization that you won.