[altairprime]

Technically, yes, that would close the specific single loophole exploitation; but that still enables airlines to do price undercutting in a single src/dst pairing without having to offer the benefits of that discount to the folks living at one of the stops between src and dst:

P(A-B-C) = 10

P(A-B) = 15

P(B-C) = 15

It’s neither fair nor logical for people traveling from B to pay more to reach C than those traveling from A, when the flight is already stopping at B regardless. So if pricing regulation comes into effect, I don’t expect they would permit that either.