OPEC may fall apart in the next 5 years. Too many large producers are not part of OPEC now.
Also, UAE has known for years they needed to build an economy that was not based on Petroleum sales. Hence the city of Dubai. It is the Vegas of the middle east. They are the only country over there that seems to be building an economy not based on energy or military.
Qatar/Saudi Arabia wants to be the natural gas supplier to Europe. However, they need the pipeline through Syria/Turkey to get it there. That is why they were interested in the overthrow of Assad. Assad is supported by Russia/Iran. Iran also wants to supply natural gas to Europe as does Russia of course.
OPEC's market share is essential unchanged over the decades, 40%, except during past times where they significantly reduced production to raise prices, then it recovered back to 40%.
This isn't the first time they have had major disagreements.