No please dont put things like the egi glamour behind that. Such things should be achievable outside of it.

I am not sure what SE can put in this to make it live long. In the end it does have to be fun because even the RNG weapon in Diadem 2.0 was not enough to keep people playing it, especially thanks to the massive amount of RNG. So if they have rewards maybe it would be better to not have them behind countless of RNG layers because that wont motivate most of the people. Maybe they could add minions to that, so that every NM has its own minion and you get it after you kill it x amount of time. (But only if you can kill those without needing a full group or it will get impossible to get them later on)