Reasons why the idea was never picked up
Ruben Diaz notes that a full-fledged comic book could have been a success if the WCW S.L.A.M Force Toyline had taken off.
Another reason could be that WCW's landscape was less mythical as compared to WWF/WWE. This might have concerned WCW's authority of involving their wrestlers in a fantastical crossover like this one.
Other than that, maybe their approach towards the idea just didn't fit correctly. WCW didn't hire a different publisher to approach the same idea in the future. This shows that the comics didn't work well within the brand when it comes to the overall image of their product.
However, there is no significant, concrete reason as to why WCW didn't want to pursue this idea. The reasons listed above are nothing but Diaz's personal opinions & speculation on this subject.
One can only contemplate as to what could have materialized if WCW indeed decided to pursue a WCW vs. Marvel Comic-Book deal. Let's see the possibilities of potential crossovers regarding this idea in the next slide.