from The Century Dictionary and Cyclopedia
- Pertaining or relating to France and Prussia: as, the Franco-Prussian war.
Sorry, no etymologies found.
Large victories however, do have a tendency to unite (consider lechfeld and the franco-prussian war), so I don't think, though overstretched, that the above was completely beyond the realms of possibility.
with the population rule which, statistically means a larger pool of good players, it will be franco-prussian war in the final. and prussia will prevail.