As Madonna once sang: you only see what your eyes wanna see. There might be some lines in is answers that can link to the points you so desperately want to be true.
However, while reading, I saw several other lines and answers that can justify that there might be nothing else than lots and lots of construction issues. He also, several times, made clear he was into no position to notice the stuff you want to complain about.
Details like runDisney itself being billed by Disney and stuff like that, other Disney branches like Hotels etc. who also can oppose course stuff are legit reason to cancel a course when combined with a lot of construction both inside and outside disney and anaheim. And as a finishing touch avoiding the high way to prevent complicated permits for the closure of ramps.
As he states: those three combined are legit reason to cancel a half marathon, and its the core of the weekend. It makes challenges, creates challenges with WDW and DLP Paris. Just doing 5K and 10K has less spots and less profit margins, while runDisney is still begin billed to run inside Disney.