With a series of right PoDs, let's consider a scenario where the Germanic migrations (specially the Gothic) destroys the ERE along with the WRE by the late 5th century. 'Destruction' meaning the abolition of the Roman high administration and replacement by Germanic kings and so, similar to what they did in the West.
Possible consequences in the long term:
- The Sassanian Empire might expand easier to Levant, Anatolia, Egypt...
- The Christianism may expand lower than ITTL, but maybe it avoid more of the divisions caused by theological disputes boosted by the OTL ERE.
- Islam, if appears, could either expand even faster (if their neighbouring entities are divided and weak) or not expand at all (if the Sassanians succeed to dominate the region).
Possible consequences in the long term:
- The Sassanian Empire might expand easier to Levant, Anatolia, Egypt...
- The Christianism may expand lower than ITTL, but maybe it avoid more of the divisions caused by theological disputes boosted by the OTL ERE.
- Islam, if appears, could either expand even faster (if their neighbouring entities are divided and weak) or not expand at all (if the Sassanians succeed to dominate the region).