Its not about more adopter to be honest, in the end most of use who use and accept BTC will still cash it out into FIAT, therefore BTC will still be a slave of FIAT. Another thing would be that, you can buy mostly everything with FIAT but you cant buy mostly everything with BTC (which ofcourse another reason on why BTC is a slave of FIAT)
Logically that's right. Maybe bitcoin is decentralization? And digital currency?
And the other reason is that there are many alternatives available for bitcoin as a currency or a payment system like fiat, credit card etc. And fiat has ruled the world since so many years so people follow fiat more.
You need fiat to buy bitcoin and you don't need bitcoin to buy a fiat. It is as simple as that. And I don't see in coming years that bitcoin will replace fiat. It is simply to impossible.
Fiat is a traditional currency and every one follows the same since years and it is more trustworthy as compared to bitcoins. Whereas Bitcoins are new to many people and would not attract instantly until they start to know it technically.
actually no, you produce bitcoin without the need of fiat, with mining(one could argue that you need to buy the miners, but you do it one time only), with signature campaign(this is a better example) or with anything that require you to invest your time and not your money
and last but not least with bitcoin itself, with trading on stocks