Remember that the 7 liter V8 was banned after the Gurney/Foyt win in 1967. Unlike 1968 when an entire, essential component of the GT40 was banned, race organizers will simply choke the new GT via weight increases, boost reduction, etc. until they are satisfied there is sufficient parity. So no, the GT won't be banned.
Ford has already established the racing reputation of the new GT. Poor finishes going forward will probably be perceived by the public as the result of punitive BoP adjustments. It's a win-win for Ford.
I think you are right on point here. :thumbsup