Not too much larger, considering that every major company and country has large amounts of assets and other financial interests that are subject to US jurisdiction. The government of Argentina recently learned that the hard way when American courts forced them to honor their sovereign debt, or have their US-based assets seized to pay them. The same applies if you want to do business in India, China, or Europe. Submit to their judgments or see your assets and interests in their jurisdiction confiscated or destroyed. Another recent example of this is French courts applying the "right to be forgotten" extraterritorially.
>No, a judge will never order anybody to enter into a different smart contract just like they don't order people into regular contracts today.
They certainly do, in effect. A court judgment very often creates new obligations between the parties. And if entering a new smart contract is the only way to right some legal wrong, then they can order that too. An American court, at least, can order just about anything it needs to in order to enforce its judgments.