I think we're getting at the root of the problem, here, because what is implicit to both of the above posts is that the republic is a closed corporate entity. The university analogy is particularly instructive, because that's precisely what tenure represents, it's a relic of the era when a college was a corporation of scholars, and tenure represented acceptance into that corporate group.
Now, not to imply that there's some sort of inherently fascistic tendency about this, just because it express one of the central assumptions of fascism about nationhood, the nation-state, and national belonging. Not to imply that at all. Wouldn't dream of it. Unthinkable. Inconceivable. Flatly absurd.
But there's something inherently illiberal about it. Something inherently reactionary. It presents the model of the modern democracy as the primitive Medieval commune, a corporation of guild-masters and their dependents. More egalitarian and more democratic, arguably. (Arguably.) But still essentially closed and inward-looking. A rejection of the republic as a universal principal, as a universalising institution, and not just an accumulation of local privileges.