The Jerusalem Center for Public Affairs (JCPA) argues that, by blowing a hole in the Gaza-Egyptian border, Hamas has reshaped its geography vis a vis Israel. As if to illustrate the point, two suicide bombers who attacked a Dimona shopping center believed to be Hamas operatives may have entered Israel via Egypt.
Gaza has transformed from its prior status as part of the Palestinian Authority to its new role as a mini-state that is now an integral part of the Arab world. Hamas will now be able to more freely obtain weapons, ammunition, explosives, and training via Egyptian Sinai. Since the border opening, advanced weapons have flowed unimpeded into Gaza across the Egyptian border, enabling the transfer of higher-grade weapons than can be smuggled via underground tunnels.
Israel will probably never be "safe" for as long as it exists because any peace it concludes with its neighbors will simply provide one more route of access for extremist groups like Hamas. But what is less apparent yet is what effect a de-facto open terrorist state in Gaza will have on Egypt which has terrorist woes of its own. One of the unintended effects of Israeli disengagement from Gaza is the forcible transfer of the parasite to Egypt, blurring the line between the two. The JCPA paper notes that "if Egypt is forced to take responsibility for Gaza, Israel will have to more carefully weigh its military responses to Hamas terror actions originating from the Strip."
Many of the distinctions the punctilious Western mind makes (i.e. between "moderate" Fatah and "radical" Hamas, between the official and unofficial acts of the Iranian government in Iraq, between the "border" of Afghanistan and Waziristan) are really diplomatic fictions. That would be alright if their fictive natures were always borne in mind. But after a time diplomatic fictions become public realities and policy is made according to fantasy rather than fact, which eventually attains to the status of convention wisdom. The Gaza-Egypt border is down: but where is it now?