By getting a majority that doesn’t give you Smicha. We’d still have to rely on excommunication and other Knasos.
But yes, enforcing the Torah is Utopia. Right now the Torah is in Galus. It was downgraded to a nice idea. But it is law. It is the law that Hashem gave us.
The Torah being enforced is not extremism. ??? ??? ???? ????? ???? ???? ????? ????? ????. Your references to other theocracies doesn’t truly portray what we had and what we will have. On the other hand, there are certain Western ideals which we don’t agree to. Namely, the new concept of giving behavior the status of a birthmark. Disapproving of certain behavior was spun into a type of racism.
For a situation where nothing is proven the best approach is to live and let live, rather than have everyone claim to be the one with the truth. This was a realization part of the world came to at last, after centuries of coercing others to follow the ideals of the host.
However, when the truth is known to everyone then it is not anymore a matter of belief. It will make perfect sense for Hashem’s law to be mandatory. It shouldn’t be harder to justify than, say, alternate side parking.