Federer's game is not boring....it's one of the most beautiful most complete games of all time. Federer is always working on improving his serve and volley. He uses S/V in matches when he thinks it's a good idea. He doesn't just play one particular style all the time.
If you think Federer is lacking challenges then you are really paying attention. It's funny because during the clay season the media was treating Federer as if his time was almost over and he was on the way out. Now you say he has no competition? Sounds like sour grapes.
I love his game, too. He is the one who drew me in front of tennis match from 2004. But, to be honest as an enthusiastic fan of Fed., he needs serious challenge from others. Owing to lacking challenge, he does not think that he need to S/V, and net game. Watch womens' game between JHH and Mouresmo. It's full of variety: wonderful baseline game, s/v in a critical moment, aggressive net point, pressing opponent dashing into the net. It's spectecular. I am, 120%, sure that Federer can do more than this!