Israel didn't unilaterally declare independence in 1948 it was based on a UN General Assembly vote which was 33 states in favour, 13 against and 10 abstained. The palestinians are talking about going to the Security Council where they don't have the islamic states supporting them. They have to deal with the US, UK, France, China and Russia who all have vetos. Even if they went to the General Assembly its not likely they would find alot more countries against than they would have expected simply because everybody knows that if they vote in favour of creating this state without Israel being onboard then they are voting in favor of a war which possibly may even turn into a regional war which nobody wants. Abbas has no intent on going to the UN its all empty threats. He is hoping this will suddenly make Bibi feel under pressure to accept all Abbas demands and its not going to work, Abbas knows a state created without Israels agreement will be dead on arrival so he wont do it.
Kerry to meet Russia's Lavrov in Malaysia on Wednesday (Reuters)
from the article: Abbas: Only solution is to declare Palestinian state