Not to mention, the second it becomes obvious that Israel has become a theocracy, it will lose quite a bit of support from many of it’s current supporters (including the U.S)
Furthermore, even if an Orthadox Jew were to become Prime minister, that doesn’t mean the rest of the legislative bodies will be willing to go along with anything he or she might say.
It would also require the large amounts of people currently in Kollel to leave and start taking up full time agriculture, if the agrarian society is the one that arises, I doubt a million+ people contributing nothing to the growing or production of food could be supported easily by the rest.
-M