The reason is simply in the ending statement of yours. Humanity is after power, everyone wants to control especial the government and elite among us. Now if you're to take away that opportunity to control, don't you think those previously benefiting will give it a fight and not just let go willing?.

Mainstream economist just don't want to let go of all they were taught and learnt in college/university about the financial system. They were made to believe money is what the Fiat system is operating without realizing their a better alternative in decentralized finance.

While some economist do this on purpose so as to decieve the general public while loading up their bags, others are ignorant of this information but with time, they'll all come to realize the true potential of the industry but hope by then, it won't be late.