They're setting Tyrande Whisperwind up to be more independent. When you go questing with her, she has the option of finding her missing husband, or going after Ysera.
With great pain, she goes after Ysera, and actually manages to function despite her hubby missing. I have the feeling that little by little they're going to keep putting Tyrande in these situations where she doesn't have Malfurion, and then boom he's killed off.
Then after that, Tyrande can rule the night elves without being *hushed* and finally go to her new love, Illidan. <3