Why Arab and Gulf Countries open his Boundry for other countries, Even to Israel

Why Arab and Gulf Countries open his Boundry for other countries, Even to Israel Maximum these countries ,Country economy depends on mineral Oil and Gas. If such country Economy depends only on Oil and Gas, this is bad sign after three or five years later. Because,3 or 5 years later, Oil/Gas demand will be decrease upto 60% . When demand will be decrease then such countries whose economy depends only on Oil and Gas, these countries economy will be badly affected. So such countries have only three or five years time to reduce dependency on Oil and Gas, otherwise these countries economy condition will go in his previous condition when these countries don't know, they have Oil and Gas in his land. I think , such countries take a nice step to open his country boundry to save his Country economy from Coming economic risk.