I never got that email, eg that the Hertz reward will no longer be available starting 7/30. I just successfully redeemed a Hertz reward, but it took me 4 tries (got "fail" and my points were credited back each time on the prior 3 attempts).
Will be sorry to see Hertz availability go, if the email you received is accurate... I realize that the usefulness of the various available rewards, vary from person to person...