I think an animated reboot of ASOIAF has potential to be better received because of how the show ended. If they indeed promise to do exactly every single aspect of the books and don't add or change stupid thinks like Talisa or removing Stoneheart, they could start doing it tomorrow and people will be somehow happy. If they cast some of the actors to do the voices, it can be absolute success.
But both SM and HP were not bad productions despite the many errors or choices they took in adaptation. When TASM was announced, people felt that they were "rebooting" the Raimi films, when it was just a different take, so that's why some took it as if they were saying "we're making a better version of what you saw", despite that was not the intention.
Same for HP. The movies, all mistakes considered, were not bad and they had their own magic. And to make it even more insulting, they aren't even adapting as the book as promised and they're already making changes on how they're interpreting the story.
I guess HP needed to keep making money and because the Newt movies were such a failure, their only option was to remake the original story. They could have made something better like making the Marauders years, for example. It'd still be Hogwarts and it would be about another wizarding word, just with "new" characters people also care for, like the marauders, young Snape, Lucius, etc. Consider also that most of the staff was the same, so we still would have Dumbledore, McGonagall, Sprout, Flitwick and Hagrid. They just don't trust any more being able to do anything new out of fear of another movie failure.
