As someone who plays almost exclusively wvw. I am highly concerned by the potential disruptive behaviour that could happen. Also allowing wvw to be accessible even only from lvl 60 will allow for upleveled individuals to take up valued space in a map and effectively sabotage server operation, whether intended or unintentional.
Since EOTM gives new players a taste of wvw without affecting the end scores i think this is a better solution. Introducing players with free accounts to a wvw server community will mean that the community often puts in effort to integrate a person or result in negative or even rejection from the community, which means that the new player will not like wvw or the game.