Presently, should we say it's good the way bitcoin its been tied to dollars? Dollars is not backed up with any resources but to my understanding, bitcoin is a product of great energy surge. We shouldn't let bitcoin tied to dollars but bitcoin standing on its own. What could decide the durability and value of bitcoin? I have some ideas..
It will not ever take place because Bitcoin is a decentralized system while the dollar is a centralized currency so how you can tie it to Bitcoin? It will take place in the imagination 
and there is no route for it in practicality. The price of bitcoin is free in the sense that nobody is controlling it while dollar is controlled by the US. I think you saw this BTC/USDT in the finance. This is just for the understanding of users because every person can easily calculate dollars but no one can do the same to Bitcoin. So the Binance made this so that the users will make a comparison of how much BTC is in dollars and there are few people who I think calculate BTC exactly into dollars air in their fiat currency.