Grayskull has already been a huge success. It really is about getting the resources and a 6" playset takes a lot. A real lot.
With rising basic costs (labor, raw materials) "finishing" the 6" line is more or a priority for 2014 and 2015 vs. tackling another giant playset. (at least for the immediate future).
I think TG is stuck back in 2002!! "6 inch line" - what measuring method is he using!!?? He clearly believes this as he keeps saying it over and over again and probably thinks we will too the more he does.