In interviews at the time and ever since, I don't think anyone said they "knew" Abbey Road was the end, but it was obvious that things were fracturing. At the time of this meeting, Klein was negotiating a new deal fwith EMI or them. So things weren't over yet. But this is where we'd really need to hear the tape to get the context. It seems like it could have been another 3 on 1 thing like with the Klein situation. It sounds like John and George were telling Paul he was only going to get four songs if they were going to continue and that they all hated Maxwell, etc. Would like to know if Paul's comment about George's songs came in response to this or not.
Regardless, I cannot imagine John would ever have stayed in the group if it meant that he would get less than a third of the songs. It really sounds like putting Paul in his place to me. And we know that two weeks later, there was a meeting where Paul was throwing out ideas as to what to do next. John shot them all down and announced he was quitting.
So while this tape should be interesting, it just doesn't seem to change the overall story to me. Things were falling apart, they agreed to work together like a group again for Abbey Road, and then things fell apart completely after that.