Problems to be encountered upon making the 6th and 7th movie

[Redbaron82101]

So when they get around to making the sixth and seventh movie, they're going to encounter some problems with the plot that have been created by earlier movie changes. I think they talked about this on Mugglecast. An obvious one is the lack of explanation of Kreacher, although I think this can be fixed with an explanation scene. What do you think?