I think the best way is for Israel and the PA to get back to the negotiating table. Also, Abbas needs to end the unity govt and Fatah needs to seek peace on it's own w/o Hamas in the govt. If Abbas and Fatah can get a state and a peace deal, it really "knock the steam" out of Hamas.
I fear some of us, particularly those who are named Luis Dantas, will need some context here.
Let me see if I got this right:
Mahmoud Abbas is the President of the Palestinian Authority (PA), and Fatah is the political party to which he is aligned.
While Abbas does not necessarily have the best of relations or even the trust of Israelis, he is still generally perceived as a much more reasonable (and less violent) interlocutor than Hamas. That of course is not saying much, but nonetheless a very relevant consideration here.
Hamas is, of course, seen as problematic by Israel. Little wonder. I would see anyone who swore to destroy me as problematic too.
Hamas is a rival of Fatah, a separate significant political tendency among the Palestinians. And at least at the moment, a far more bloodthirsty one.
However, the political situation among the Palestinians has been rather troubled in the last ten years or so. Among other very questionable situations, Abbas' mandate has long expired, yet he refused to step down, so his legitimacy is in question. In part for that reason, he has been attempting an
unity government where many, even most of the influential positions are occupied by Hamas members while many others are from Fatah.
This is a CNN newspiece from 2011 covering a certain point of the efforts at an understanding between Fatah and Hamas.
If I am correct in that understanding of the situation, then it would seen that your suggestion has a major obstacle to overcome: Abbas's legitimacy is questionable enough to begin with. Attempting to sidestep Hamas at this point could very easily jeopardize what is left of his credibility, perhaps violently. For all anyone knows, that might be 1979's Iran all over again.
I can't blame you for wanting that to be possible and to happen. But I don't know that it is a good thing to try without a lot of evidence that it is safe to do so.