He hasn't won a big title since early September, and I'm getting very worried.
What big title did you expect him to win since the US Open? The only main tournament left was the Masters Cup in Shanghai and we all knew what went wrong there.
Actually I'm more worried about Murray and Nole on hardcourts. Particularly since each had a huge indoor season.
Roger won the last two matches against Novak, one on hardcourts. Murray is beside Nadal probably the most difficult match-up for Roger, but he won their most important encounter so far and therefore I can live with the other losses against him.
I don't know if you just want to troll in the new year or are really serious. If this is the case then you might just concentrate on following younger players who have their future ahead. Roger isn't going to get any younger and he won't dominate the game as he did in the past.