The islands' wishes were leading in the selection of a new currency, with particular attention to the consequences for tourism and trade.
Most tourists hail from USD-area countries. In addition, imports and exports to and from Bonaire, Saba, St Maarten and St Eustatius primarily involve countries using the US dollar or a USD-linked currency. Most other countries and overseas territories in the Caribbean area use the US dollar or a USD-linked currency as their legal tender. And the Netherlands Antillean guilder had been linked to the US dollar with a fixed rate of NAF 1.79 = USD 1.00 since 1971. Last but not least, the United States have no objection to the use of the US dollar as legal tender in other countries.
Given the above, it would have been less obvious to opt for the euro, the European currency used in the Netherlands. Moreover, it would have exposed Bonaire, St Eustatius and Saba to exchange rate risk and potential adverse consequences for trade and tourism.