Perhaps I should rephrase to clarify. The system wasn’t meant to impose observance on large group that doesn’t want to observe the law.
A Sanhedrin should not be executing people left and right. If, to enforce the Torah law, they are required to execute to many people, they will stop enforcing the law, not ratchet up the enforcement.
All this is theoretical, of course. There is no Bais Din today that has the authority to use corporal punishment.
Whether or not it is proper to force Torah observance on a large scale depends on what is meant. If you mean there is broad nationwide acceptance of Torah observance and what is necessary is a mass scale system of enforcement on the occasional infraction, then yes. If you mean that there is large minority that do not wish to observe the Torah at all, and you mean forcing them at gunpoint to keep the Torah, then no.