I don't think there will be a VP card tat relies on coin tokens. This makes them all VP tokens, or rather, VP tokens for every copy of the green card you have, which seems quite warping. Oh yeah, AND you can spend them at some point. Baker+that card even is just going to be bananas, and he's not going to let such a 2-card combo exist, particularly in the same expansion.
Gaining coin tokens for overspending IS something we might see, though I don't really see it being connected to a victory card - more likely you'd have a something like village that gives a coin token for every overspending you do on it, costing 4.