Don't update to system menu 4.3 !!!
You should not update your wii to sys menu 4.3 as there is nothing in it for you and also, it will remove all your softmods, possibly brick your wii, and prevent you from installing HBC again as it blocks the JODI ticket and the HAXX ticket. If it bricks your wii, you will have no brick solution and you are screwed. So if N keeps telling you to update, don't. Also, you can turn on parental controls to make it harder for family to update.
Waninkoko's safe 4.3 updater is out, but I'd still say don't update.