Novak should go to Indian wells and should try his best to clinch the rank 1 position and of course he should aim for the YEC as well.
This is a no brainer, only fanatics of Sampras would want Novak to not aim for 1
He is a professional athlete who is fit, he is not some injured guy recuperating his knee or something. After the YEC when clinched the rank 1 mathematically he can rest the remaining time till the Aus open .... no big deal.... a few months will be enough
If I was Novak then I would fight tooth and nail to clinch this year end 1 because it will help break ties with Sampras and that matters.