Latin Empire of Constantinople

The Latins get massive help in the 1240s or 1250s. This enables them to hold out much longer. As a result, the Greeks don't retake Constantinople in 1261. What does this do to the balance of power? If the Byzantines are still in Nicea in about 1300, will the Ottomans or another Turkish sultanate become powerful? What does mean for the Venetians, Genoese, and the Frankish states in Greece?
 
Top