Remakes are such a complicated issue. One one hand, it'd be great if there were huge batches of brand new ideas and material. But at the same time, if a movie was made over 20 years ago and was good, odds are that a lot of people haven't seen it, and because most people don't take the time to go back and watch old movies, the only way for them to see the concept in movie form is if it is re-made and re-released. That way it appeals to the mainstream fan, with stars they recognize, updated visuals, and maybe even with changed elements so it has greater relevance.
I think the only problem with remakes (this goes for sequels too), and I agree this has happened in the past, is when the remake(sequel) is poorly made because the powers that be are banking on the well known name. I don't see this as an issue for Wickerman.