You have to ask yourself has quake ever been anything else than a host for dm6 and ztn really?
Seriously though I think these maps are so extremely popular that they might have hurt the ql scene and now QC (to be fair qc only has 3 maps so you have to keep them for now). Im not involved in the cs:go scene at all but I heard there were tournaments where they removed dust2 from the cycle and it turned out to be good. I think scrapping fan favorites can be a good thing. /discuss
q4 had dm6 but it wasnt much played because there were so many much better maps made by the community.
qc can also have lots of good maps made by the community.... ohhh wait :x