If you're not a Muslim, do you thank (insert your preferred Deity here) that these two groups are NOT on the same page?
Do you

everyday for them to continue focusing so much negative energy on each other, instead of joining forces and aiming at the common thorn in their paws?
My preferred Deity... my 'God', told me that their conflict is necessary for peace, that's why the conflict evolved.
Exciting times, eh?
There are some countries, where Shiites are the majority, but the only Shiite governed country is Iran.
The Middle-East doesn't even account for 1/3rd of total Muslim population on this earth.
Within the Middle-East, the only friction between Shiites and Sunnites is between S.Arabia and Iran. This friction follows the logic of power politics.
Some of those countries, where Shiites are in the majority or constitute a significant size of the population, are the countries of the Gulf-Cooperation-Council.
A Council, where S.Arabia is the biggest horse.
In the areas, where S.Arabia's biggest oil-reserves are located, live Saudi Shiites.
If Iran were to bring Iraq under its full control, then Iran would practically border S.Arabia and would have better options to manipulate the wind-direction in the relations not only between Iran-S.Arabia, but between all countries in the Gulf.
Iran would also become THE power of the Gulf.
Other then that, there doesn't exist much friction between Shiites and Sunnites.
The friction is contained to Iraq and to the question of Iraq's future.
Some turmoil at some times between Shiites and Sunnites happens also in Pakistan, but that friction is not the main turmoil in Pakistan.