Assuming it would be created, and survive after being proclaimed, it would be hard to be maintained afterwards.
Remember that we're talking of a personal collection of demesne, often quite rebellious, with different origins, interests and backgrounds.
It won't exactly be a "warlord state", but nevertheless a structure that lives thanks to an individual or at least quite nwarrow project.
Burgundy was an important actor of western Europe mostly thanks to two factors.
1) Weakening of Valois authority during HYW, allowing the Valois-Burgundy to set up a political faction in the kingdom ("Bourguignons" weren't an independentist faction, but more close of a political "party") as Charles of Navarre managed to influence kingdom's social and political movement during Charles V's regency.
With the re-strenghening of Valois authority, their influence and therefore their support in France would be quite limited, and even more so if they decide to sever all ties. Eventually, they'll loose their allies there if they simply decide to get out of the game.
2) Weakening of Imperial authority.
Collecting demesnes that they claimed ("rightfully" or not) was possible because the empire couldn't efficiently intervene, and more or less used their ambitions as a "rear support" (without real effect, as Charles of Burgundy never really tried to do his part on that)
Eventually, it allowed Burgundy to expand, but it also expanded the number of their rivals at the same rate (rivality that Valois exploited with much constance).
Would these rivals strengthen themselves (Swiss way) or imperial authority, we'd have a different song to sing.
Furthermore, the politic of territorial expansion was very costly, as the dukes couldn't count too much on local nobility (that they fought sometimes) or urban militias (that acted independently) even if Burgundy forces were important of their own (and critically were one of the most modern of Europe at their time.
Burgundy share some characteristic with "border kingdoms" that popped once and a while in ancient times (as the, older, Kingdom of Burgundy). Skilled leader, opportunistic policies, weak or distracted neighbours.
Too ambitious policies, strengthing of its rivals eventually made the appearance of a true Burgundian state a failure.
It doesn't mean that it wouldn't happen IATL, but it would be hard to maintain and would be eventually be absorbated, or eaten piece by piece.
The only PoDs I can think of that would allow such super-Burgundy you depict on your map (something that even Charles of Burgundy never dreamed of) is a catastrophic failure or collapse of both French, Empire and German states.