If I had to guess I'd say that it's only possible through the direct effort of an exalt if it can happen at all.Oh, yes. There's absolutely a cost / separation law, concerning human (mortal) magic practitioners from mortal population. That law expresses itself differently in different eras, and the expression seems to relate to human perception/ state of society.
The interesting question is - does Salinan Working still exist? If we unearth the steps towards Sorcery initiation, would the mortal who goes through it
a) Explode into giblets
b) Lose their magic, with a possibility of relearning it (same as we are doing right now)
c) Get access to ancient sorcery
d) Lose the bane (and possibly the mind corruption effect of mortal magic)
e) All of the above
Not necessarily because of power so much as position and access. The rules have changed and old school exalted era sorcery is deprecated. There's nothing there that will acknowledge them in the first place.