I'm not so sure. After all, admirals must go through Borg space for tour. Lt level chars only need to do Sirius and Regulus.
Either way wouldn't really surprise me.
We'll have to see if any of the new sector allows access if you AREN'T participating in the reputation system, just like starbases aren't accessible to those NOT in fleets. DS said people could 'opt-out' of the rep system if they chose to.