I disagree with this thread. FFXIV will put anything into their game that fans want as long as they can justify how it fits into the world. Frontlines PvP is here because the GC's have a dispute over some Allagan ruins. Wolf's Den is there for any group of anybodies to bash faces in. Frontlines will unlikely change how it operates, but we COULD try asking SE to put out something 'similar' to Frontlines that would make sense.

Example: Eorzean vs Garlean forces. 24 vs 24. Half the players are assigned to play the role of 'Garleans' trying to retake (random Castrum name).