That old saying of if you only have a hammer, then you see all problems as nails is very apropos for the declining economic and political power of Saudi Arabia. Because as their hold over OPEC wanes into that of a paper tiger, and their economic output declines in relation to their falling oil production, the Middle Eastern power has found itself relegated towards wars of conquest under the guise of religious jihad.
There was really no reason for the Saudi's to have turned on their neighbors in Yemen, except for the fact that they desperately needed new reserves of oil to sustain their power and economic growth. But as that conflict has become mired in a stalemate on par with the U.S.'s involvement in Afghanistan, the Saudi's then chose a gambit which is quickly coming to be to their detriment as they find themselves outmatched by the weight of Qatar's allies.
The last thing the Saudi's wanted was for Qatar to reinforce and return to strong relations with Iran, but that is exactly what has occurred as on Aug. 24, the government of Qatar re-established diplomatic relations with the Shiite country, and has solidified a partnership that could soon include both Russia and China as a bonus.
In addition to having the support of Iran at its back, Qatar already has Turkey willing to come to their aid, especially if Saudi Arabia and anyone within the GCC alliance dares to cross over the border with troops, aircraft, or land based artillery.
Thanks in large part to failed U.S. policies in the region, the once solid coalition of OPEC nations is now being shattered to where half are favorable to Russian and Chinese influence, and the other half hold a tenuous affiliation with Washington and the petrodollar. But the more and more that oil prices remain low and create growing internal turmoil for countries that rely upon energy sales as their chief economic output, the closer the Middle East gets to a complete shattering of alliances as each nation will look to protect their own, even to the detriment of their former partners and religious affiliated neighbors.