When downgrading, you will not be able to transfer out until you get a "higher earning" MR card. Just something to keep in mind.
If you want to keep the MR, you need to apply for a card that gives you MR. Everyday card gives you Dollar Rewards, not MR. If you ask them for an incentive to keep the card open for another year, it might be worth paying the AF.
Some clarification required. Is the following true?
To retain MR points ( avoid losing them when you close a card) you need to have another card which earns MR points.
To transfer MR points to FF programs, you need A Gold card or higher.