If N is known the number of tracks can be scanned. When it's too close to N, the supervisor will be warned and he will use ATFM procedures to avoid the override. ATCOs will be advised too.
If N is reached, one can use the backup radar system (based on 20 years ago's simpler technology, N is not the same). Strips are still available, automatic co-ordinations still work (however, not with the same interface).
No real big change in procedures.