Have you any data to back up how this change has affected other forums? If not can I suggest that nothing is done until 'you' have some proof that user volumes, post turnover etcetera are not adversely affected rather than implementing a trial based on no statistics, that MAY harm NSC irrevocably?
No
Why does anyone have anyone on an ignore list?
Restricting use will reduce turnover
If some decide to ban everyone and start a load of topics it could bring the whole thing down
NSC is the top forum, if it aint broke...