In the previous threads about spec tires the majority of racers were against it in 1/12th. 1/12th is the oldest class in RC on-road racing and it has never needed a spec tire. I don't think a spec tire will help make it bigger either. It somewhat works in WGT because of the heavier cars and the bigger difference in width from front to rear. But even with that we've had to do some more extreme things to get them to work...anyone remember truing off the yellow foam? Look at what is happening with WGT too...in the overall view of RC it is still a fairly new class, is it growing? Not really...at best it is stagnant and in some places it is shrinking. The thing holding pan car classes back in general is the fact that you have to cut tires. And with a spec tire that would still be a major obstacle.
Now I'm not necessarily advocating rubber tires either. Rubber tires in their current form simply do not work well on pan cars. If they did then the F1 classes would be more popular and not come and go over time like they have. This generation of F1 tires is far better than previous ones so I think they are getting closer. But they are not there yet. What keeps F1 coming back is the cool scale looks. Until someone puts some serious development time and effort into a rubber tire that handles much better then I think all our pan car classes are going to remain stagnant to dwindling.
To me...there in lies the solution for pan cars...better scale appearance and a rubber tire that works. I don't know if it is even possible...but I do think not enough energy has been directed toward it.