I think your recommendation is sound. Being new to the truffle arena, I had some confusion over what was what, and after attending the Oregon truffle festival I discovered I didn’t really care for the Oregon white. Having some common nomenclature would certainly prevent me from purchasing a product I don’t really care for.
I also believe it will help curb those less than forthright merchants if a standard is used. While they may still offer a “black” truffle, having a standard will allow consumers to have a common language and give them the information necessary to ask “which black truffle”.