WillyPete

That's a good point.

Although Sinn Fein have achieved many of their goals, they, as a party, have ceased the military option.
There are still a few hardliners with ties to the party who refuse to give up until all of the Irish island is under one government (Theirs) but they do not represent the elected government.

I think the same will have to be said for Hamas. They cannot act as a terrorist organisation any longer. An act of violence initiated by them is a sovereign act of war and thus such an act would allow for much stronger action by Isreal and such retaliatory action would have more legal validity with the international community than have previous actions against terrorist groups within Palestine.
They would be freed from attacking a group within a sovereign state to begin attacks against a state as a whole, targeting ANY valid targets of military, economic or infrastructure value and not just personnel.
Compare how Isreal have reacted when attacks against them have been state initiated, such as the 6 day war, golan heights, etc.
A state validated action against Isreal would allow an unleashing of a much more potent military action and would weaken the ability of neighboring states such as Syria, Egypt and Lebanon as Isreal's action can then be seen as legitimate defense.