WI: William II of Sicily lives longer and has a surviving heir?

This kinda goes with the Hohenstaufen threads that have popped up recently. Part of the Staufens problem was the dueling interests in Germany and Sicily, starting from Henry VI's invasion of the later in the 1190s. This invasion was triggered by the death of William II of Sicily and the subsequent Coronation of his illegitimate cousin Tancred instead of William's aunt and Henry VI's wife Constance. This conquest eventually led to the deterioration of the Hohenstaufen dynasty and its collapse.

So my question/scenario is this: what if William II of Sicily (only 33/34 when he died) lived longer and fathered a surviving son? This keeps the Normans in control of Sicily and keeps Henry VI out of southern Italy. What would the long-term ramifications of this be?
 
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If William II had a surviving and legitimate son, I can imagine a Norman Sicily that is still going to be a thorn on the side of the Byzantines. (Something that largely stopped once the Hohenstaufens on the throne, even though most of that time frame was spent during the period of the Latin Empire, and was only restarted with Charles d'Anjou). Whether or not William or his heirs (Roger III?) would restart abortive attempts at forming a Norman Africa or Egypt is another matter entirely however.
 
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