I really don't think that 90Hz is necessary, after using an Oculus Rift DK2 - with a 75Hz refresh rate - for extended periods. 75Hz is definitely good enough for me, but perhaps other people are more sensitive?
Personally, I think VR headsets will be awesome when they get to 4K per eye. Maybe by the time 4K displays with a 90Hz refresh rate are available for VR headsets, the graphics technology will be almost good enough to handle it...
Biting the hand that feeds IT
