Hogwarts ongoing staffing problems

[ebeth0000000000]

No: HPFGUIDX 138398

I have been wondering about next year's staffing at Hogwarts.

1.  Next year, we can fairly safely assume "Professor" Snape will not 
be returning to his post as DAD.  We now know the position is cursed, 
with no one able to hold the job for more than one year.  So who will 
be next year's DAD teacher?  

2.  Will Slughorn stay on as Potions master next year?  If he leaves, 
will he succumb to the Death Eaters/LV as he feared?

3.  With McGonagall as headmaster, will she continue to serve as 
Gryffindor's head of house?

4.  After Trelawney's repeated threats to leave Hogwarts, will she 
make good on her threats and become vulnerable to Death Eater/LV 
attacks, capture, and memory charms?  Will the discovery of the
"true" 
prophecy actually mean anything for LV?  Will Firenze continue 
teaching?

5.  Will we ever learn anything about Professor Sinistra?  

Assuming (without much canon in support of it) that Harry goes back
to 
Hogwarts, or even if he doesn't but still needs to brew potions in
the 
course of tracking down the Horcruxes, will he continue to use the
HBP 
book to help him?  He'll need to make excellent potions, even if the 
person he hates the most wrote the book.  He'll have to go back and 
find it, first, which means he'll definitely have to go to Hogwarts, 
if only to pick it up.