We all know that bitcoin is the king and father of all digital assets. Bitcoin was created for 2 purposes.
1. To be an alternative to fiat currency.
It works for me. I use Bitcoin to pay for my bills, buy items online, pay for game credits and many more that work the same way spending fiat currency. I don't know what is your meaning of being alternative, but I also believe that it will never replace fiat currency because of the current government and financial institutions' authority beliefs atm.
2. Stay free from govt control.
Bitcoins network system is free from gov't control and I believe it will stay as it is. As the earlier reply stated, being banned doesn't mean it is controlled. It is simply being rejected. and these two words (controlled, banned) are very different from each other.
At present some big online marketplaces accept bitcoin but from being an alternative payment to fiat currency I think we are still behind. We also saw many countries are hostile towards bitcoin and china baned everything related to bitcoin. So china's ban on bitcoin shows that it's free from govt control or its the opposite? Bitcoin can really be the alternative to fiat in spite of this extreme volatility?
I think you are referring to global adoption not being an alternative payment to fiat because it (Bitcoin) is already working as an alternative at least to its (Bitcoin) users/holders, the lacking is the global adoption and system that will use it as global payment.