The IDF must not become a professional volunteer army because whilst it will save them money it will cost the country a fortune.
Many of the countries best and brightest learn skills in the IDF and afterwards put those skills to use in the civilian sector if the IDF becomes a professional army most people will never have access to these technologies.
I used to be friendly with somebody in Kfar Saba her brother and his friend using skills they learned in the IDF developed the Kinect thats used with the X Box and they sold it to Microsoft and became very rich.
Without the IDF these people wouldn't have understood the technology so never invented it.
Also conventional wars are not a thing of the past, what happens if there is a war, the IDF owns 1000 tanks but they only have 500 soldiers capable of driving the tanks.
Unmanned and scaled down is not the solution to everything.