Respectfully, whether a village has or does not have access to magic, and thus by means of some "magic accrual abacus" outweighs, in comparison, Greyhawk's villages or not, has no standing with High or Low Magic, IME. The PCs are the story that as a group act out their play in a Fantasy world backdrop; and it is certain, whether villages have access to such arcana, like a commoner having access to candy from a candy shop, that they will continue to have that at their disposal, for the game is sculpted for that very reason and outcome, to further their engagement in a magical Fantasy realm. The gods to commoners are feared and respected and entreated rarely or with uncertainty at the very least; and for heroes they are patrons and their champions, or at some point their adversaries. This is Heroic Fantasy, so even if you limit the magic, limit the heroes, you just have less--but still being every player character group--which is still 100% of the players having that access. That villagers do not have it is inconsequential, as they are part of the backdrop the PCs are navigating through in their story.