I highly doubt Rafa plays those small South American clay tournaments next year. Nole won AO and Dubai but his results, aside from MC, USO and Wimbledon, were generally woeful the rest of the year until Fall. Semis at IW, 4th round Miami, 4th round Madrid, Quarter Rome, Semis at RG (not woeful there, but that was always the earliest he would lose) Semis in Canada, and quarters in Cincy). I don't picture him doing as terrible in most of those tournaments as he did this year. Meanwhile Rafa won IW, Toronto and Cincy which are huge surprises and carry as many points as 1.5 majors.
Nole will have a lot of opportunity to regain #1 by RG or USO next year even if he does lose to Nadal in the final of AO, which I don't think I'd bet on. Nole is a lot stronger at AO than USO where his resume is hardly great when you think about it.