If the IDF moves from quick raids to holding territory, the Blue Line ceases to be a mere buffer. It becomes a contested border. This shift would likely collapse the current UNIFIL-led status quo, forcing the international community to choose between recognizing new borders or engaging in endless border skirmishes.
Diplomatically, this creates a nightmare for Lebanese sovereignty. Beirut would face immense domestic pressure to resist Israeli encroachment, potentially radicalizing local political factions. For Israel, holding land in Lebanon means a permanent drain on military resources and a constant target for non-state actors. The friction point moves from a line on a map to a physical trench system.
Regional powers will react quickly. Iran and its allies might use this territorial change to justify larger-scale escalations, arguing that the established international order has already failed. Instead of managing a frozen conflict, neighbors would find themselves managing a hot, permanent frontier. This turns a localized dispute into a structural feature of Middle Eastern geopolitics, making future peace treaties much harder to negotiate.