My kids are pretty much the same age as yours. It's certainly still appropriate now. I see one of two things in their future. Either it will become clear to me that my son is getting too aggressive with my daughter, or my daughter will specifically request a private bath. She likes a good, long soak. Luckily, my son is finished long before she is so it's no big deal. I'm not really worried about it.
Danielle, Nick, Gigi ('08) and William ('11)