The Dutch tourist bureau won't speak of "Holland" anymore, but of "the Netherlands", as reported in this article in the Guardian, to get rid of the image of tulips, windmills and cows, and to stimulate tourists to visit other parts of the country.
I doubt whether it will work. For most foreigners "Holland" is just another name for the Netherlands, not limited to the two provinces in the western part in which the icons of Amsterdam, Delft and Kinderdijk happen to be situated.
The whole nomenclature for the Netherlands is confusing. The English "Netherlands" is a full synonym of "Low Countries", which is used for present-day Netherlands and Belgium combined. The equivalent of "Low Countries" in other languages - such as the French "Pays-Bas" - is reserved for the Netherlands, with the exclusion of Belgium.
It all has to do with the history of these two countries. Having been one political entity until the present-day Netherlands got its independence (officially in 1648), it was part of the Spanish empire. The independent republic got known as the "United Provinces" or the "United Netherlands". The western provinces being the most important for trade and politics, "Holland" became the name for the country as a whole, like "England" is often used for the whole of Great Britain.
Only with their independence - in 1830 - Belgium got its present name. Before the brief period of reunification with the northern Netherlands in 1813, it was known as the "Spanish Netherlands" (later, after one of the geopolitical moves of those days, the "Austrian Netherlands").