The Bible says that Israel has 70 weeks,or 490 years,to get in the truth,and recognize Jesus as their Messiah.69 weeks have passed,with one more week,or 7 years,to go,which has not happened yet,because Israel as a nation has not recognized Jesus as their Messiah.
That is Israel is blinded in part,because Israel as a nation does not recognize Jesus as their Messiah.
The disciples asked Jesus when the kingdom would be restored to them,which He said do not worry about it,for the Father will do it in due time,but go preach the Gospel,which in the millennial reign of Christ is when the kingdom will be restored to them.
Israel is blinded in part in that they do not recognize Jesus as their Messiah,until the fulness of the Gentiles be come in,which is when they take the mark of the beast,which then repentance is no longer available to them,and God will only work with Israel at that time.
That is the purpose of the 7 years period,to bring Israel to the truth,fulfilling the 70th week,and causing all people that do not love God to follow the beast kingdom.