Who's going to ensure the 'security'? And steps have been and are being taken against the citizens of the Gaza Strip to prevent economic development. Remember, it's a different situation. You can't apply the case of a general nation with resources and the general economics presumptions to a completely different context.
You are right, my statement was a general one and every country or aspiring country has their own unique situation, specially Palestine. Bro, I have very little idea about the real on the ground situation there, but from what I have seen and heard from a distance, your best bet is to come to some sort of deal with the Israeli's, negotiated between Arab League and Israel, under supervision of the quartet. If you do not come to a deal, they will continue to keep making new settlement homes and taking away your land.
I have also heard that Israel will use any means to avoid peace and if they are close to a deal, they will sabotage it somehow using Mossad, just so they can continue to steal land. So in your interest, you need to stop reacting to any provocation or instigation, before you come to a comprehensive deal.
Once such a deal is reached, Gaza economy should be integrated more with Egypt, while West Bank economy should be integrated more with Jordan.
You may not like to hear this, as I have repeated earlier, fighting will get you nowhere, I think Israeli's want you to fight, so they can avoid a peace deal and continue to steal land and change facts on the ground, so that two states solution is no longer feasible.
But if they have a one state solution, then Palestinians due to higher birth rate become majority in a Jewish state, so that is not an option for them either. So two state it will be, question is how big or small it will be.