I disagree with that. The biggest problem of the republic was that they only cared for money. Of course that was part of their greatest strengths, it meant they realy did have a lot of money, but they ignored everything else. They more or less disbanded and ignored the army and navy after the Dutch revolt; they found out it wasn't a good idea the hard way during the first Anglo-Dutch war and Franco-Dutch war.
part of the massive Army and Navy restrictions were part of the power struggle, wish i had my copy of 'The Dutch Republic, it's rise, greatness and fall' on hand, since it features exact numbers of Dutch army strength in 1640, the numbers included in the proposed army reduction, and the extreme army reduction enacted after Willem II's almost succesfull coup attempt (smallpox caused it to fail, and we dodged a massive bullet there). The numbers were something like: 1640: almost 80000 men, proposed 35000 men, post-coup: less than 20000 men. But without the book i can't be exactly sure wether those numbers are correct.
Naval strength was destroyed by greed however. The Admiralties selling almost all their ships, especially the big ones was a stupid move. At the start of the first Anglo-Dutch war the Brederode was our most powerfull ship, at least 18 English ships had more firepower than that vessel, a serious oversight, especially since few Dutch ships came close to Brederode's firepower. Tromp really saved the Dutch Republic during that war. What I know for sure is that the Dutch fleet numbered 79 warships at the start of the war with only 2/3s of that seaworthy. Though due to rising tensions with the English they were converting 150 merchantmen into warships, the war began before those were ready.
So looking back at my post, I think we both are right, Caring for money led to unacceptable budgetcuts, and the sudden States General victory in the power struggle led to even worse reductions.