Is this group even active anymore? Maybe you could consider getting some new contributors or something if you think it's too much for you to handle at the moment? It's just that this is (was?) a nice group so it's a bit sad if you're just going to let it quietly fall apart. I'm not 100% about the situation here but considering that Canines&Felines 4 folder has been full for for a while and there hasn't been any new journals since September it doesn't seem too good.