Rudolf IV Duke of Austria lives

Rudolf IV, Duke of Austria from 1358-1365 was a very interesting man, married to the daughter of HRE Charles IV, he managed to bring many changes to Austria and to Vienna itself, his sudden death in 1365, led to the partition of Austrian lands in 1379 between his brothers Albert and Leopold.

Now what I am wondering is what if he does not die in 1365 and has issue with his wife?

Does this lead to a stronger Austria? A potentially earlier candidacy for the HRE?

What might happen with regards to his brothers?
 
If Rudolf IV survives and has issue, then does that mean that the division of austrian lands never comes into being, or would the need to ensure some level of stability mean he'd give some lands to Albert and Leopold?
 
Rudolf IV, Duke of Austria (b.1339: d.1419) m. Catherine of Bohemia (b.1342: d.1388) (a), Marie I de Coucy (b.1366: d.1405) (b), Bonne of Artois (b.1496: d.1425) (c)

1b) Margaret of Austria (b.1387: d.1408) m. Edward, King of Portugal (b.1391: d.1438) (a)

1a) Edward, Prince of Portugal (b.1405: d.1405)

2a) Alfonso, Prince of Portugal (b.1407)

3a) Maria of Portugal (b.1408)​

2b) Rudolf V, Duke of Austria (b.1390: d.1439) m. Philippa of England (b.1394: d.1430) (a), Isabella of Brittany (b.1411: d.1444) (b)

1b) Charles of Austria (b.1432: d.1434)

2b) Joan of Austria (b.1435)

3b) Stillborn Boy (c.1437)​

3b) Joanna of Austria (b.1391: d.1414)

4b) Albert, Count of Soissons (b.1394: d.1435) m. Marguerite d'Orleans (b.1406: d.1466) (a)

1a) Albert III, Duke of Austria (b.1421)

2a) Charles, Count of Soissons (b.1423)

3a) Rudolf of Soissons (b.1426: d.1430)​

5c) Mary of Austria (b.1417: d.1454) m. Louis, Duke of Savoy (b.1413: d.1465)

1a) Pierre of Savoy (b.1438: d.1449)

2a) Louis of Savoy (b.1440: d.1450)

3a) Philip II, Duke of Savoy (b.1444)

4a) Charlotte of Savoy (b.1445)

5a) Janus of Savoy (b.1447: d.1450)

6a) Jean of Savoy (b.1448: d.1450)​
 
Here's what I am thinking, without some of the internal bickering that came from a joint rulership, Rudolf manages to successfully acquire the port of Trieste, through defeating Venice through subtle as well warring means. Rudolf then manages to acquire the lands his brothers did otl, as well as helping contribute to the overthrow of Wenceslaus.
 
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