My two pence worth...I will comfortably hit Platinum in 2019 and I am looking forward to that next step, it will be off the back of 80/90 nights away from home. Given the changes, I will need to spend over 120 nights away to obtain diamond and so have no chance.

It depends on how Accor want to reward loyalty. 7 nights in one hotel in an expensive market (say NYC) will be rewarded more than 100 nights for Accor in a lower bracket where there will still be great margin for Accor.

The PR talks about living accor - choosing to spend 100 nights a year in an accor is more loyal, and living the brand, than one week a year in an expensive market.