How are future crusades impacted, and how does it effect enthusiasm (or lack of it) for crusading over the course of the 13th century?
OTL, sometime between the middle and the end of the 13th century, the precarious situation of the surviving Crusader states seems to have been more and more "So what?".
It seems unlikely that crusading enthusiasm can be kept up forever - the European kingdoms simply have too many other projects more immediately relevant. But that Jerusalem being retaken does nothing except add another slice of territory to the rickety state and things collapse more or less as OTL seems going too far the other way. Surely at the least this impacts whether or not the 4th Crusade happens as OTL (the part up to arriving at Venice, not the sack of Constantinople), as the situation is very different.
OTL, sometime between the middle and the end of the 13th century, the precarious situation of the surviving Crusader states seems to have been more and more "So what?".
It seems unlikely that crusading enthusiasm can be kept up forever - the European kingdoms simply have too many other projects more immediately relevant. But that Jerusalem being retaken does nothing except add another slice of territory to the rickety state and things collapse more or less as OTL seems going too far the other way. Surely at the least this impacts whether or not the 4th Crusade happens as OTL (the part up to arriving at Venice, not the sack of Constantinople), as the situation is very different.