The hardest thing for me when I gave up buying DC floppies a little over a year ago wasn't giving up the mainstream comics (all of the titles that I was buying were cancelled, so that was pretty easy in fact), it was giving up the Johnny DC comics. But there were so few of these titles that it didn't seem worth it to keep buying them and DC tends to collect everything in TPBs eventually.
I had been buying various Johnny DC titles for some twenty years by then. I think they're just as attractive to older readers as younger readers, perhaps because they remind a person of the fun comics they read as a child.
I was really bummed out when the Superman & Batman Magazine got cancelled after only eight issues in the 90s. These were published quarterly by Welsh Publishing--featured some nice art by Mike Parobeck. My understanding is (correct me if I'm wrong) these were doing just fine in sales, but DC didn't want to continue letting Welsh use their animated characters.
I never understood why DC had never done this kind of magazine on its own. When Jenette Kahn came to DC this was the kind of magazine I expected her to launch. Maybe not tied into animation necessarily (although there were a few DC properties on Saturday morning TV in the late 70s), but some kid magazine in the tradition of Kids, Dynamite, or Smash--the magazines that she had published and probably the very reason she was hired as DC's publisher in the first place.
The company that Kahn helped reach the kid market, just before she came to DC, Scholastic is now an industry leader in publications for young readers. It confounds me that Kahn never used her expertise to give DC a comparable profile.