Has anyone noticed...

Has anyone noticed that manga and anime creators aren't using original ideas anymore and because of that, they're all trying to remake their shows and take out or add more stuff to it? Here's an example or two.

Hellsing/Hellsing Ultimate
Dragonball Z/Dragonball Z Kai
Astroboy
Speed Racer
Fullmetal Alchemist/Fullmetal Alchemist: Brotherhood.

Why can't they leave some of it alone. Dragonball z kai is not a great remake, though blending together and shortening the episodes and sagas are a good idea but Dragonball Z got ruined because of that. :/ I only watch it because of my favorite characters (trunks, piccolo, vegeta, etc).

The best remakes are Hellsing Ultimate and FMA: brotherhood. But that's only because the originals strayed from the mangas.

So what's your opinion on anime remakes?