I'd argue that if the show was written with the same level of love for the show that fans of the original have, then it will be successful both in keeping the original fans, and attracting the new people as well.

It is understandable that some changes are necessary when moving from anime to live action, everyone understands this. Anime lacks the detail of live action and therefore is exaggerated in order to convey feelings or thoughts of characters, where live action may only need a subtle gesture or body language to convey the same thing. But that doesn't mean characters or major plot elements need to be altered in any way.

A video game example of this is Elden Ring. FROMSOFTWARE did not make a game to appeal to the mass market. They made a game that fans of their previous works would love, that due to its difficult nature should have been opposite of what the mass market wants. And yet the game was successful at captivating both audiences and sold a huge amount of copies having passed 20 million copies as of February 2023. Compare this with anything that gets altered to "appeal to a wider audience." That phrase is literally a death sentence. Neither fans of the original or new people end up liking it. Yet people keep choosing that path, and keep wondering why everyone says their work is garbage.