I found this video
It is US Centric, but given the main pre occupation on here is how the reward systems work I found it an interesting 15 minutes.
BA will be no different, but I do acknowledge that the video is not specifically about BA.
There has been speculation on here before that BA will move to a money spent miles credit and a cash proxy cost in miles for flights. I have little doubt have looked at this video that this will happen in the end.