"What if" situations seem a bit stupid to bring up at this point. The fact is, not every retainer is selling something. FFXIV is receiving its fixes over time. The market wards work and work pretty well. These "band-aids" are enough to keep the system functional while they focus on more important matters.
We had alot in this last patch that we didnt see coming. It's fair to assume that we'll see the same in the next two patches. Dont be surprised if some overhaul to the wards is in those patches