Basically if government integrates blockchain into their systems it will be easier for them to track everything in a point of illegal activities where basically they will know everything that is bad to each countries economy considering false bills, corruptions, every kind of fraudulent activities.

In other way it would help ease the legalizations for each country where the acceptance of cryptocurrencies would probabily be helped out and approved in a faster way if the government see that it was beneficial for those countries and there were not so many illegal activities.