This was about time, you don't have to be genius to know that sooner or later Saudi Arabia would have to interfere before Iran put their hands in the Gulf like they did in Syria and Iraq and Yemen.
It's clear, this is Iran vs Saudi Arabia, both are foreign political cancer in the region and have done nothing to slightly lower the tension for the past 10 years.
Saudi Arabia will not let Iran politically grow through their Shiite Militia's in Gulf region, and Iran's foreign policy will never stop to strengthen their tools/men in the region and be the force they are today on the political table against the West and Gulf.