There are so many things in this world to feel genuine sadness for-- even within the fashion industry. Sadness for not being able to wear new designs from your favorite designers really shouldn't be one of them.
No one can touch Jil while she is still around and fully competent as a designer, so anyone filling in for her will be-- and as shown by Raf, has been, lesser than her.
I think Jil will return to fashion in time. I hope she'll do it independent of her namesake so that it's genuinely all hers. I hope to see her be more like Alaia in her return. Judging by her last few collections, she still has it in her-- although the last collection looks very much rushed and definitely not her at her most thoughtful best.
for me the sadness is seeing jil departing again especially so soon after just returning and being sorely missed on the scene for those years prior. i don't think there's anything wrong with that. when you're missing those real and authentic voices with a real sense of integrity in a medium that's becoming depleted by the minute and being replaced with poseurs,wannabes,ego-maniacs and redundants,it makes you realize how supremely important they are and have been. and for me jil is certainly one of those people. so it's a blow to many who are faithful.
but like you i do hope she makes a return in her own right….start another company…perhaps take the label she utilised at uniqlo and apply it to her own business.