I don't see the point in this, really. While there is a good amount of unused plots by inactive players, there is also a major part of active users who have a lot of plots they've worked hard on, and older members may even have old build maps on their plots, like some of the PZ (not Solari) builders. I also have many old plots that are almost two years olds, which most took a very long time to make and I doubt I could replicate.
To reset all of creative would not only erase a user's hard work and quite possibly irreplaceable builds, but also completely wipe memories. I've had many fond memories on my own plot, whether from build with old members of the server or playing with them on my plot or quite simply just building this.
In my opinion, to do all that which I stated above to a user is just awful. I don't agree with creative getting a full reset. If plots cause lag or are causing issues, the staff can take care of them.