Hellblade is in my opinion overrated. Sure great graphics, cool story but gameplay and controls were mid. Never finished it. I don’t have any interest in the second one.
Will never happen even if Nintendo wanted to. Miyazaki is probably not interested to turn a videogame into a movie. And even if he was he wants full control and write the screenplay. Like he has done with every adaptation. That’s probably not something Nintendo wants. Since every adaptation he made is very different from the source material (except the source material he wrote)