You are right. I don't recall receiving a notice saying that plans were changing and that should I decide to switch to a Pay Per Day rate that I would not be able to go back to my previous 'true' Pay-As-You-Go. I say 'true' because how can a plan be a Pay-As-You-Go plan if I am required to pay $3 per month? It should be call the $3 per Month Plan.
I didn't receive any email notice of any change to the Gold Member or that it was being renamed Legacy Plan either.