The fact that AA.RN is currently offering up to 20 miles/$ (+5 for email, +5 for feedback) makes me think they're less likely to just drop the 5+5 Bonus we currently have. If they do drop it, I see it providing more promotional periods to make up for the lack of a constant 5+5.
On a side note... I dined at a restaurant on 9/29 and noticed on 10/1 that it was listed as "NEW" on iDine. I don't know when they joined, but I was excited to see them on there. Do most restaurants join on at the beginning of the month? I was curious on whether miles would hit for my 9/29 dine... It was never mentioned in any of my RN e-mails that they were joining the network and I didn't notice they were on the network 'til 10/1.