We live in interesting times. We must change our thinking to compensate. From clearly theoretical perspective and ignoring the current geopolitical realities, Islamic nations are actually in a time were joining up into a larger bloc makes more sense then ever. The new cold war with the dollar future status in question. Plus the fact that bulk of the worlds future population growth will come largely from Muslim regions. Population growth is one factor in potential economic growth (combined with human development, technology and finance). One can argue if managed correctly, that the future economic growth potential of the Islamic world 100 to 200 years out as a whole is better than Europe, North America, East Asia or India's (as these regions with go into demographic decline over the same period). Not sure that OIC is willing to take any actions on a broader economic pact? If not a new bloc is needed.The relationship were excellent in past times, remarkable and based on religion, brotherhood and mutual trust.
Time passed and our fool politicians pushes these relation to the corner where our so called leaderships start milking KSA for their personal financial interests/gains and in return accepted all legal/illegal conditions or strings and hence transformed the relations to master/slave level.
Now we want the relations back to the old times but now it is too late. KSA leadership is now in hands of 'generation next' and only looking for financial/political gains and to maintain the leadership role in OIC.
The split in leadership role for Islamic countries is a writing on the wall. These countries will be further weaken and more vulnerable.
Some blocks even depend on those countries who will harm them more than save - milking opportunities will take shift to anti-Islamic countries but those blocks will consider that as gain - time will tell that it was a gain or loss.