Removing local from Nul has been a really _really_long standing topic. In some ways I think W-Space was something of an experiment to see how it impacted gameplay.
If the view is that resources are too easily acquired in Nul, then there is some argument for removing local OR moving those resources out of Nul (but then why be there?).
Personally I have felt that Local as an information tool should degrade as Sec status reduces. But there should also be some options for Buffing a degraded local: maybe not permanently but for short durations by deploying scanners and the like (destructable?)
Balancing that would be quite tricky but feasible?