EXP and levels seem to be at the heart of the game so I don't see them going. One of the motivations for playing is to get the nextt level.
I think it will mainly be the low levels who will hide their level and so it will be assumed that anyone hiding their level is low; other players may then choose not to engage as there will be no EXP and/or they are not experienced players worth engaging with.
I think it will mainly be the low levels who will hide their level and so it will be assumed that anyone hiding their level is low; other players may then choose not to engage as there will be no EXP and/or they are not experienced players worth engaging with.