There are a lot of good mangas that didn't have a chance to be adapted into anime, nowadays.
Why do they keep adapting the same type of animes over and over again?
-Virtual reality anime that people got tired sick of them.
-Harem anime, where all the cliché girls falls in love with the main character because he was nice to each of them, once in his life and they remembered it their entire lives
-"I want to be Hokage/king of the pirates/lord of the wizards/monarch of the bandits...etc" style animes
- Merchandising animes, where people takes a children's game too seriously (cards, spinning tops, mahjong...etc)
-Medieval animes. I have nothing against them but the main plot of most of them is "Let's go to an adverture/ Let's do a quest"