Since June 2009 the new Acropolis museum took over from the old one, which has remained empty. However, today, the proposal for the reuse of it got approval from the Directorate of Museums of the Ministry of Culture.
source: http://www.iefimerida.gr/news/187224/palio-moyseio-tis-akropolis-ston-iero-vraho-zontaneyei-xana-poia-tha-einai-i-nea-hrisi#ixzz3PG5aEyaX