Yes, at the end of the day the material just has to be good. I've no doubt that a talented writer can turn Flintstones, Jetsons, Scooby or whatever into something completely different but if it still hits the right notes it can be good.

Velma's just poor execution plain and simple.

Harvey Birdman is like D or C list character anyway, so they were free to mess around with it and nobody really took it seriously. Scooby Doo is A list so to speak and has an established... I guess we'll call it canon or something. You can't mess with that.

Same thing will probably happen with maybe a Flinstones or Jetsons remake with stoner kids or deadbeat parents.

Plus Harvey Birdman is actually funny and elevated the character. Velma doesn't elevate anything but also downgrades everything.

What they needed to do was get another nobody-really-takes-seriously character and should've messed with that, let's say... Muttley or Dick Dastardly or I dunno Droopy or something.