Some massive over-reactions here. I reckon we'll be fine as long as we actually back the batting talent in the state and don't just stack the team with bowlers. By all rights Haddin should probably be with us for basically the entire season and both he and Nevill are good enough to play in the Shield as batsmen alone, so that's a plus there that no-one has really mentioned.
In my years of following this team there have been many, many factors stopping us from world domination - disruption of the side by players coming in and out, prolonged under-performance of PONIs, awfully balanced teams, ageism, randomly blacklisted players, Scott Coyte etc etc - but lack of talent in the state has never been one of those problems. An exodus from New South Wales is always going to be a positive for Australian cricket overall as we have the depth and talent to cover for it more than any other side, and while I'd have definitely have preferred if some of the fast bowlers left rather than our entire top order, I think we'll be right.
I wouldn't be against bringing someone like Cooper back home if he was interested but I don't think we should really need to go on a recruitment drive and take the homegrown talents of other states; we're better than that. If it means giving Cruickshank, Dawson, Henry or Thornely a run in the side then I'm absolutely okay with that - I'll probably enjoy cheering someone like that on more than Hughes or Khawaja anyway and I definitely like the idea more than Shaun Marsh or Liam Davis in the side. As long as it doesn't mean that Henriques, Smith and O'Keefe are all in the top six, and we actually try to develop a proper middle order, then we'll be sweet.