It's most likely going to be replaced, but it will serve you for a while in 3.0. We don't know how long the leveling process from 50-60 is going to take, so who's to say how long that will actually be. If you're only concerned about ilvl, you can get a poetic weapon as Jimbo suggested. If you want to grind to keep yourself busy, have at it, though perhaps don't invest too much gil in your sphere scroll. I'm working on a WHM relic, only at animus books, while gathering poetics to get a weapon for another class.