I was born after the establishment of the monotonic system and so I was taught polytonic in secondary education (Gymnasium - Lyceum). Today, all young Greeks are required to attend school from the age of six to the age of fifteen (in other words, primary school and the Gymnasium). This compulsory education includes three years of compulsory instruction in ancient Greek. Furthermore, most also attend Lyceum where ancient Greek is a compulsory subject in the first and second years, and optional in the third. The conclusion is that with the current system, all the Greek youth has been taught the polytonic system for three to six years. Therefore, as is natural, most (if not all) of them know how to write in polytonic. If the government wanted to restore the polytonic system tomorrow, it would not be to hard for the citizens to adjust to it.
Like most supporters of the polytonic system, I doubt the moral ‘legitimacy’ of the method used to establish the monotonic system. I believe that such a change to the people’s language should only have been made with a referendum. I know many people who would like the restoration of the polytonic system and the only reason they are hesitant is technical restrictions, in other words, how will they write on computers. I must admit that it is much harder when compared with monotonic to write polytonic. The only way to change their mind in my opinion would be to distribute programs which would make writing polytonic easier, and a fast way to convert monotonic text to polytonic (for texts which already exist). Such programs would be able to be distributed on the website of the Ministry of Education and Religious Affairs (which so far only distributes polytonic fonts).
I believe that only someone who is indifferent to his cultural heritage could do that to his language. Similar changes were made by Mao Zedong’s communists in China ‘simplifying’ the Chinese script by eliminating hundreds of ancient ideographs, and the communists in Bulgaria, who inspired by the theories of Comintern on the existence of a ‘Macedonian nation’ in Skopje, ‘reformed’ their script to emphasize the differences between Bulgarians and ‘Macedonians’ eliminating old (Slavonic) letters such as the ‘yat’ (Ѣ/ѣ).
People do not forget their heritage though: in Hong Kong, Macao and Taiwan, the Chinese persist to this day in using the original Chinese script, and Bulgarian politicians have expressed the desire to reverse the communist reforms. So and also the Greeks will not forget the ancient Greek script. There were indeed difficulties in the past which lead to the establishment of the monotonic system, but thanks to modern technology, those difficulties no longer exist. If the Chinese, who even with the simplified script have several thousand ideographs, can write comfortably, then of course Greeks can also write comfortably with the polytonic system.