I get your points,

, and I do think a "re-imagining" can be fun as long as there is respect for the source material. (like in Tiny Toons, which was true to the zany Warner Bros type slapstick--Anamaniacs even more so) I'm sorry, but the Thundercats playing in a rock band sure doesn't sound like a whole lot of respect for that show!
Funny you should mention anime above, ShyViolet, because the japanese are rather (in)famous for 're-imagining' their most popular anime shows, every generation or so; ASTROBOY, GIGANTOR, GATCHAMAN, SPEED RACER, YAMATO, and many others, have all had multiple incarnations -- some of which were 'faithful' to the original, and some which were drastically different .
Oh wow, I didn't know that. Maybe they do it better than Americans do.

I just know that shows like Extreme Ghostbusters and X-Men evolution have not been very well received by fans of the original....and they don't seem terribly popular with today's kids, either--although I could be wrong.
Funny thing about Thundercats though--in some (or many) ways it was a rip-off of Star Wars, as Lion-O and his "Sword of Omens" was very similar to Luke and his light sabre; Jaga's etheral visits to Lion-O during his times of need (and Jaga's ghostly form) directly echo Obi-Wan's conversations with Luke...Jaga even has the same beard as Obi.
And oh right, who could forget the Ewoks, uh...I mean the Burbles!
BTW, despite often being not terribly creative, 80's shows had the distinction of airing during a conservative age when the FCC kept a much closer eye on children's cartoons. Many of the cartoons of that time emphasized group action, problem solving, and triumph over difficullties with a linear plot structure. (Some, like Thundercats, had actual child psychologists on the writing staff.)
Maybe they weren't as "unique" as today's cartoons, but at least there was a sense of comfort and safety associated with them. Many of today's cartoon shows are so full of quick cuts, non-sequiters, references, quips, and gags that's a wonder that children today don't have a nervous breakdown from watching them.

You can’t just have your characters announce how they feel! That makes me feel angry!