I too hope the protesters suceed in getting their politicians to listen to them and, preferably get the rest of the world to realise that tourismn is not necessarily a good thing.
The mass influx of people every year to natural beauty spots or man-made places such as Delphi or The Acropolis is damaging.
We could also argue that culturally it has not been an entirely good thing that people have travelled so much and so easily in the 20th century.
Far from broadening our outlooks and promoting good understanding between the nations of the world, quite often an adverse effect has occurred.
We are fast getting to the point where we ALL celebrate Christmas, whether we are Christians or not, Hallowe'en whether it is part of our country's tradition or not, often to the detriment of a local tradition, we all wear the same clothes, made and sold by the same gigantic firms. We all learn English, even if we intend to holiday in a country that has a different native language.
These are examples, but they stem from tourism and damage our culture as much as the mass influx of people and their modes of transport damage the (physical) environment
Time to stop, pause and reflect, then perhaps to see the point of cutting back on tourism amongst other damaging things.