On the plus side, this debt could generate RP on a few different levels. If you feel trapped where you are, you'd have to ass-kiss, convince, and prove your way into another corp even more. Corpies would try to leave for the Mix, only to find themselves hunted for their debt. On the other hand, some players may feel it's not worth playing their character once that debt becomes a problem they can't afford, and will go jumping off skywalks in the hopes of starting fresh.
This system actually would have worked better without the perk system, because EVERYONE would be in debt, but maybe those perks cost a certain amount that's added to a character's debt. The point is, it feels unthemely for a corp to invest in something, then be totally fine with losing that investment, no matter how small. There should be some kind of system in place to ensure loyalty.