Except it leaves him open to the Williamses too, and they have the straight-line speed to be a true menace if you end up behind them. The best tactic is to ignore everything else and drive your own race, the moment you try and influence someone else's race you leave yourself vulnerable and over the years many drivers have suffered because they focused too much on what they want their rival to do and not the race itself.
Driving his own race without worrying about anyone else is a luxury Rosberg would have if he'd won a couple more battles against Hamilton earlier in the season. As it is, he has no such luxury. He made it clear in the post-qualy press conference, he didn't just go to Abu Dhabi to win the race, he went there for the title, so he has to try this.
As I say, in my view the best tactic is to wait until near the end of the race, because for all we know Hamilton's car is only destined to make it to lap 40, in which case it would be unfortunate for Rosberg to say the least if he tried to force the issue and get Hamilton out of the top 2 on lap 20 and ended up in the wall. Also, if he suceeded in pushing Hamilton down to P3 on lap 20, Hamilton would have 35 laps in which to make his way back into the top two.
The best thing is to wait until after the final stops and then try. I don't think it will work, because I think Hamilton would pass him. But I guess this is where the seed Rosberg planted at Spa may finally come good for him, because Hamilton knows that closing the door on Rosberg can be dangerous.
I'm actually really looking forward to this race. I think it would have been a lot more straightforward for Hamilton if he'd got pole. And I think if he ever gets into the lead, it will probably be straightforward for him again as long as he has the pace to control the gap to Rosberg. But while Rosberg leads, there are ways and means to make things awkward for Hamilton.