Bitcoin will always be dependent on fiat. Only if people were to completely accept bitcoin would fiat be rendered useless.
Yeah, and I don't see it happening in near future as the market cap of fiat is huge as compared bitcoin, so bitcoin would be surely dependent on fiat in future too.
There are chances if everything goes digital then we can expect that people would use more bitcoins as a payment method in compare to fiat, but that doesn't mean fiat will simply disappear.
That's true even if everything goes digital we would still find many users that would be dependent on fiat and they would continue to use fiat as they are using it since a long period of time.
That's the problem with traditional people as they don't want to experiment with new things, they would stick to the same thing they are used and never entertain the innovative things.
That's not true even the older generation wants something new, and if they don't some new things then they would never accept internet too, but now they are used to it, only thing they want is good return on their investments and its difficult for them to trust bitcoins at a moment.