actually sth similar was written my neighbourhood (g... to griva sas) , for quite a while, and nobody came to write over it.
but i wouldnt be surprised if someone did.
the thing is, that writing on the walls is not sth that is in fashion anymore.
it used to be like that especially in the late 60s and early 70s. then came the fights over the posters. one side puts , the other side puts on top of it, and then people have fights. but those were the times were the young people were deeply political. (i can recall my father doing things like that
)
nowadays the young generation is interested about football, fashion, the brand of their mobile and their car. dont ask me to tell you which generation i prefer, bc i really have difficulties in answering
(the big-grafity time, only errupted again short before the referendum, and then stopped again...)