Interesting thought.
I think JanPrimus is in the right direction.
17 Provinces stay in one kind of goverment body, maybe including some of the German lands like Julich, Mark, Berg, Kleve and Ravenstein.
Amsterdam laready took over the Baltic trade from Antwerp, befor it fell. And this was the trade which brought the real richess to Amsterdam, the Asian trade was only the cherry on top of the cake.
Furhter I think this part of the Habsburg realm eventualy split form it, as one, more centralised body under presure form other powers and internal forces. Possible it was first part of a split between Spanish and Austrian Habsburg. It would be brake eventually from Ahbsburg rule, since the Low Countries had a continuos internal strife between cities and provinces, and Lords. Cities and Provinces who want to keep (or wanted more) self rule and overlords who wanted a more cetralised gouvenment in order to increase their influence. This was esentillly the core reason of the Dutch revolt.
The real question is what effect would it have on Fance and the British Isles.