Of course it would be good if FIAT and crypto could get along but those worlds are opposed in nature. The reason they are interested in crypto could be varied but it is likely to free themselves from the fiat system as it currently stands.
If in combination this will indeed be a very good system. With the various advantages possessed by each then we will be able to use a much better financial system. Fiat and crypto will become a very varied system and can improve the financial system in the world today.