Any reasonable person knows that there is no good reason from this point for the GOP to push the Benghazi conspiracy any further. They have assembled another committee in the house to investigate the attack. However, if impeachment is their goal - and it certainly appears to be - then they have basically zero chance to achieve that. The reason I say that is because the time has already run out for that to lead to a successful impeachment of President Obama before his presidency ends in 2017. There is no chance that the committee could come up with sufficient charges in time for the pre-trial and trial to happen before then.
This means that in the most favorable - by which I mean most damning possible conclusions from the house committee - situation, the GOP will still be wasting taxpayer time and money when the 2016 election happens. In the - more likely based on what previous investigations have shown - scenario where the committee does not produce something worthy of an impeachment hearing, the GOP will have to face the fact that they wasted millions (if not billions) of taxpayer dollars and a great amount of time on what is clearly a political witch hunt.
Similarly, while conservatives are almost uniformly (and mostly alone) convinced that Obama himself somehow caused the Benghazi attack (presumably as part of his NWO aspirations, by use of his time machine and weather control technology), they also seem convinced of one other thing - that Hillary Clinton will be the democratic nominee for POTUS in 2016. Frankly I am not convinced that she will win the nomination, but that is a different matter. More so I am left to wonder if the GOP fears Clinton so much that they have actually decided to throw the 2016 election in the interest of trying to start framing a better 2020 campaign now.