There's too much money to be made by whomever. But the question is, engineering the blends after the fact, picking apart surviving McClellands tins, rather than blending from the start as did the McClellands, it may be sometime or never before they can produce something even similar.
Let's assume for a moment that the McNeills decide to reverse their previous stance on selling their IP. What you will get is a tin with a McClelland name and logo. The contents will be something else, given that Mike won't be running the pipeline, it will be a different pipeline, the suppliers will be different. The components will be different.
A lot of manufacturers tired to duplicate the McClelland house style, not beginners, but very experienced manufacturers, and nobody pulled it off. The key missing ingredient will be Mike McNeill, an irreplaceable ingredient.
But maybe it's enough for people to smoke something named Mcclelland that bears little to no resemblance to the real stuff. That's what people will get. Personally that holds zero interest for me.