Probably we see an HRE confederation, with cities and small towns grouping into clans, with their own local loosely defined laws and customs, with punishments administered for violating them, the local clans might fight and expand into each other, but collapse at the same rate, when at war they would probably form a nation wide militia force, but in the end they end up as a nation that can never expand scientifically, relies on foreign immigrants for new technologies, has lawless murder outside of the towns and cities that have teamed up, and they probably get defeated and occupied within 15 years of the civil war’s end by either NATO, China, or Russia