semi-oldfag here, two things REALLY hurt the IP's reputation
For one, the production of Real Adventures was a mess. They ended up having to combine two different projects to make it. I think that, on top of that, I think the messy production hurt it's chances to have a timely launch for things like toys or games.
Second, and this is really big- Turner invested so much in RA, that it oversaturated it for the next few years. It got to the point where you could probably run through the series a few times a year. It became a staple of lock filler- Toonami was semi-infamous for having it on for two years straight. When they did promo shows it was the first one to cut, like when they had a Beast Wars week.
Toonami's programmers recognized the frustration- and it's one of the shows targeted in a Toonami promo about reruns
https://youtu.be/bPD7p7BnNx4?si=OA7C4CDuHcIY9ktT
That segment is interesting because it basically a prelude to 1999 and all the big changes that would happen to tonnami that would make it go from a mix of American cartoon reruns and some syndicated localized anime, to being more of an anime block with more faithful(for what they could do) localization
Real Adventures was made for when Turner was planning to make original action cartoons for their channel. Then Toonami showed that there was a much bigger market for just acquiring dubbed anime. That ended up putting JQ out of the playing field for the next few years, and he just never had a chance to have a comeback