I am pretty sure I will lose my status soon too, but to be honest its likely a good thing. IHG platinum means very little at most of their properties and the upgrades almost never happen (and now hotels have learned to just move you to higher floor of the same room so its even less valuable).
I have been staying at Marriott's more and am very impressed with their service. Even as a lowly silver member I often get room upgrades. On a whole it sucks to lose Platinum, but now that the program has changed I am not going to chase it. I will however, keep my ambassador status with IC as the free weekend night is pretty useful and the room upgrades are decent.