Whoa Whoa whoa, one thing you forget to mention is that the moths were experiencing a significant downturn in participation before foiling techology was developed! Now they've got many companies around the world (some very large ones too) not able to build them fast enough to keep up with demand!!! Moths are experiencing a world wide resurgence since they introduced foils!!! So how can you say that foiling has hurt the class!!!
There was also a discussion about banning controllable surfaces on the foilers early in their development. The top guys just said, "ok, we'll learn to sail them no matter what the rules...control surfaces or not..."
Admittedly the marketing of moths has helped this resurgence.
Don't fear the technology. We'd still be in the dark ages if we feared technology.
You wouldn't be banning the boats retrospectively, just the components!