I am not a Fed fan by any means, but I have to say I am shocked that he gave up the race for YE#1. I know it's cliche'd to say that this may be his "last chance" to do anything, but at his age YE#1's are going to be rarer and rarer to come by. I guess it would be nothing more than a footnote if he ended this year as #1 considering all he's done, but as close as he is I'd have thought he'd have given it a go.
it was impossible, I can't remember Fed winning (and even playing) 3 indoor hardcourt tournaments in 3 weeks ever, not even to mention at 31 years old and in his current condition which is not very good, which is understandable at his age after what he did in the last year(s).
Besides, Djokovic looked great in Asia and seems to finish the year very well and even if Fed had won everything, which I think had 0.5% chance, Djokovic surely would have got the necessary points.
Yes for Fed it was certainly the last final possibility to be year-end number 1. Well he lost it in the US Open and Asia to a great player in his prime years (it would have been easier in the end of the 90s or beginning of the 2000s).
Now back to other goals : hoping to win the WTF, giving it a try in all slams and staying in top-4 as long as he can, because this is important to keep opportunities of winning slams, and this is not a given : Berdych, Del Po, Ferrer are fighting hard and Fed has not had a good second end of year so far which should usually be good for him.