Sometimes on diverse royal forums I read a plea for Soestdijk being restored and given in royal use again. Until Queen Juliana and Prince Bernhard became the inhabitants, the palace has always been used as a summer residence, as a pied-à-terre.
Now in 2015, with all modern transportation available, there is no need for another royal residence. Yes, it would be charming when the Court would use the Royal Palace Amsterdam, Noordeinde, Huis ten Bosch, Soestdijk, Het Loo and the Stadtholderly Court but it is really not the era of three first Kings anymore, when horsedrawn carriages were the main means of transportation.
I have read a suggestion to make a Museum Of The 19th Century, with the palace restored in splendid state and underground floors added for exhibiting the museal collections.
An example: the 17th C Mauritshuis
(former palace for Prince Maurits of Nassau-Siegen)
The extension under the 17th C Mauritshuis (this is the foyer
leading to the various underground galleries). The modern extension doubled the space of the original 17th C house and nothing can be seen from outside. Wonderfully done.