Yes! I think this is the most correct option. The idea is to radically change everything, get rid of fiat money and use only crypto - this idea is utopian. If you do everything smoothly, using the advantages of both fiat money and cryptocurrency, then no problems will arise.
There will always be problems with either of the two and some people will always find ways to blame one another.
But does not mean that crypto will not stay or fiat will not remain. Fiat will be there as long a different mode of assigning value to crypto is not found. Maybe gold will be there but still there has not been any such advancement except that few altcoins were released which were backed by gold. There will be governments and they are always anti bitocoin and so fiat does not have any place to exit even if it wanted to.