In the Midbar (and shortly after) the Shevet levi was 2.5% of the total community, not including converts. 10% of 3 major commodities went to them so that they could be supported with honor.
If we can grow a Shomer Shabbos community to have 1 million families, 25,000 kollel families can be supported BeKavod (with honor).
In Israel if the “secular” majority will see orthodoxy not as those relying upon the state, then there will be better success with Kiruv (bringing them back to keep Shabbos).