The Duchy of Swabia (
Herzogtum Schwaben), originally also known as Alamannia, was an entity existing between 911 (or or 915) and 1268 (or 1308 with Johann
parricida von Habsburg) in the Holy Roman Empire.
It was one of the five stem Duchies (
Stammesherzogtümer) of the East Francia, and occupied a territory more or less coincident with that of the later Swabian Circle of the HRE.
(In yellow in the map)
The fortunes of the Duchy becamr eventually tied to the Hohenstaufen family (eslecially after the Zähringen got extinct in 1218) and thus to the quarrel between Empire and Papacy, which indirectly caused the dissolution of the Duchy when its last heir Konradin was executed in Naples by Charles d'Anjou after his failed attempt to reclaim the Kingdom of Sicily for his House. The Habsburg restoration attempt was also at least in part made more difficult by the fact that Konradin haf pawned or otherwise signed off significant territories and rights to finance his doomed expedition.
Now what if for any reason Konradin doesn't try to reclaim Sicily and instead stays in Germany, pribably being unsuccessful in his imperial bid, but leaving heir(s) and a more or less intact Duchy?
Assuming the dinasty doesn't die off too quickly or doesn't splinter too much, what would eventually be of Schwaben?
Is it possible that the causes which lead to the Swiss cantons forming and fighting against Habsburg and Burgundy would not be there? What impact would this have on the development of the Swiss pike square?
Would Swabia eventually be elevated to an electorate, possibly even to a Kingdom?
Very very long term, could an independent country based around Swabia still be independent today, or would it necessarily be subsumed into Germany? Could it even end up leading German unification?