The current reserves of NKF are sufficient to last at least 6 years in the worst case scenario, and up to 12 years, in the best case scenario--even if they don't raise a single dollar. So they don't need any money now.
In view of this, I would not contribute to the New NKF now or in the near future. They have yet to prove themselves worthy of my donation, and it is not clear at all whether they will fully and effectively institute all of the changes that are necessary to reform it.
No kidney patient will suffer for lack of donation. We can afford to take a wait-and-see attitude and see if the new NKF changes for the better. I would guess that their reserves of at least 6 years is probably among the richest out of all the charities out there.
There are much more worthy charities out there that deserve your money, who are worse financial situation. And if the new NKF management can prove that they have instituted the needed changes, and if their reserves are running low, then I would reconsider.