Without a Marriage to Elisabeth of Luxemburg, Would the Habsburgs Still Have Dominated?

I must admit, I’ve overlooked the possibility for this match before or if it’s even likely, but here it is. The 14th century in the Holy Roman Empire was sort of a see-sawing between the Wittelsbachs and the Luxemburgs. It saw its last gasp at the imperial election where Sigmund of Luxemburg, king of Bohemia and Hungary, walked away with the imperial diadem. However, Siggie only had one child, a daughter, Eliska/Elisabeth (b.1409), who he later wed to Albrecht of Habsburg.

The Wittelsbach anti-king, Rupprecht III of the Palatinate (d.1410) had married his eldest son and heir, Ludwig III, Elector Palatine, to Henry IV of England’s eldest daughter, Blanche. Blanche was unfortunately dead by the time of the imperial election, but her son, Rupprecht (b.1406) was still alive. Ludwig III only remarried in 1417 to Matilda of Savoy.

Now, here’s my question, could a rapprochement between the Wittelsbachs and the Luxemburgs be effected by marrying Rupprecht (b.1406) to Eliska/Elisabeth (b.1409)? And if such a marriage were to occur (assume that Rupprecht lives beyond his 1426 death date) and bear fruit, what would this mean for the future of the Holy Roman Empire/kingdoms of Bohemia and Hungary? Wittelsbach rule instead of Habsburg? Or would it merely raise someone else up in opposition to the Wittelsbachs?
 
So I was thinking that the marriage between Elisabeth and Rupprecht could take place around 1421/1422 (her OTL marriage date - she's twelve/thirteen to Rupprecht's sixteen).
 
How does this look for surviving kids (I get we're perhaps putting the cart before the horse, but I figure since no one's said that there's a snowball's chance in hell of the match happening, it can go ahead):

  • George, King of Hungary, Bohemia & Croatia (b.1430) (I figure since one of Elisabeth's sons was named Georg OTL, and St. George is a favoured saint of the house of Wittelsbach it could work)
  • Elisabeth (b.1432)
  • Blanka (b.1434) (figure Rupprecht will want to name at least one daughter after his mom)
  • Barbara (not sure if Elisabeth would want to name a daughter after her mom, since she didn't OTL) (b.1435)
  • Ludwig/Rupprecht/Sigmund (b.1440)
As to the Palatinate, I'm not sure whether to let Georg/Jiri inherit that too (wasn't there a thing that someone couldn't hold two electoral votes?), or if that should go to a son of Rupprecht III by a second marriage.
 
So, I changed the thread title, because I've been wondering whether a marriage to Albrecht is set in stone after it becomes clear that Sigmund isn't having more kids. And if she doesn't marry Albrecht, how do the Habsburgs fare? They've got less of a claim to Hungary-Bohemia-the Empire than OTL, now. And where might Albrecht marry for that matter? Or does he simply die a bachelor?
 
Luxembourgs made pact with Habsburgs about survival (house that would survive longer Doyle inherit lands of extinct one). Sigismund confirmed it in 1421. Also he needed marriage with Albertine Habsburgs due to Leopoldine line getting closer to Jagiełło.​
 

krieger

Banned
Luxembourgs made pact with Habsburgs about survival (house that would survive longer Doyle inherit lands of extinct one). Sigismund confirmed it in 1421. Also he needed marriage with Albertine Habsburgs due to Leopoldine line getting closer to Jagiełło.​

Yes, but Sigismund himself considered abandoning pacts. He even proposed his daughter to Jagiełło himself (although it couldn't work), but if Jagiełło had a son with Anna of Celje born instead of Hedwig IOTL? Than we could see a marriage of Elizabeth to a Jagiellon prince, given pro-Polish leanings of Queen Barbara and common Celje ancestry between Władysław (most probably name of the son) and Elżbieta.
 
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