Old cartoons/anime/shows.

Biker Mice From Mars
Samurai Pizza Cats
Street Sharks

They were pretty lame to begin with so it's not like a remake could be much worse.

Ben 10. The original. Not the spin offs, live action, or 'sequels' where the animation changed. Gimme the old first rendition of the show continued as it was before.

Men in Black

Most of them just could use more episodes (with the same crews which is impossible)
Edd, Ed 'n' Eddy
Courage the Cowardly Dog
Kids Next Door
and I could/would see a retouched Yu Yu Hakusho with some extra animations and maybe a bit more to the fights. Storyline, characters, art style are nice, but rewatching it shown how reused some attacks are ... simplistic? (moving background, static character with idk, icycles, hit enemy flying, then mirror the whole thing to see it like they were hit again) And that got pretty repetitive when it was about more important characters, in multiple episodes. So, just show and animate more fighting, but that's all. Still a really entertaining story.

Jayce And the Wheeled Warriors. Definitely my favourite show when I was wee.

Aladdin (the series), Pinky and the Brain, Ulysses 31 and Darkwing Duck

Updating wouldn't even work for some of these, because their charm is that they took older shows an twisted them into something new. But I would love to see more episodes.
Space Ghost Coast to Coast
The Brak Show
Sealab 2021
Home Movies

'Gatchaman'. The real one, not that butchered up one they showed in the US called 'Battle of the Planets'.

まの子ジャッキー Shīton dōbutsu-ki kuma no ko Jakkī, Seaton dōbutsuki: Kuma no ko Jacky

I want The Pirates of Dark Water finished. Such a cool show that didn't get enough episodes.

Attack No. 1 (1968-1970). I enjoyed the story and probably still would, but the art style feels more than just "a bit" dated.

nothing! =P
it's been so many years, more than a decade, that i don't watch anime, cartoons or whatever else.. I just watch tv for some hours per week and nothing more.. some movies with my gf on the laptop from time to time =P
and I never watched any kind of series, I don't even know what netflix is XD (i used to watch stargate sg1 back in the days though!)
anyways, I grew up for many years with so many fantastic anime that really I've got so many beautiful memories that I'd love to keep as they are <3

SWAT Kats: The Radical Squadron. A show so obscure that if you want to buy it on a DVD, you have to get it individually manufactured. (And even then, they just print the old VHS release on it in digital form.)

Grendizer, period.

Tintin. I want a sequel to the 3D animated film. :(

most of those old TAS-the animated series cartoon
x man tas
spiderman tas
fantastic four tas
great story, meh animation style. i still watch some of them

The Mysterious Cities of Gold!
Edit: WAIT, THERE IS A SEQUEL!!!!! YES!

All the "Es war einmal... " series

Robotech

How about some kind of version of Captain N - The Game Master

• I could do with a redone version of the original Super Dimenson Fortress Macross series. (which in the US got tooled into the first part of Robotech). Story is still strong, but the animation, as good as it was for it's tile is but really showing it's age.

• Last year an animated version of Naoki Urasawa's Pluto was announced. That covers the Tetsuwan Atom/Astro Boy remake well enough.

• Anyone else remember COPS ?

• I alsto still want a a Battletech series that does not suck.

Life with Louie.