Something I've wondering is that several "native" Netherlandish houses died out in this period (Holland, comital Burgundy, Hainaut, Flanders, Brabant, ducal Burgundy and Guelders). The Habsburgs later developed a tendency for advantageous/fortuitous marriages (as exemplified by Matyas Corvinus' statement of "marry happy Austria").
Some of these extinctions of Netherlandish houses are freak accidents (like ducal Burgundy that saw the death of BOTH Philippe of Rouvres and his dad when they struggled to stay on their horses) or bad luck (Odo IV had SIX sons of whom only ONE survived to leave issue; the duke of Brabant had three, all of which died young; etc). So, to still ASSUME they would occur in a similar fashion seems a bit odd.
But WOULD the Habsburgs be able to EXPAND their holdings in the Low Countries by fortunate marriages/inheritances?
@Parma @isabella @HJ Tulp