You had asked about riders affected by the closures...the stats are finally back online...trips per day would be each way, so one day of work would equal two trips.
Ventura County Line
Stations: 12
Trains per Day: 31
Average Weekday Ridership: 4300
Average Amtrak Ridership: 167
(Amtrak allows Metrolink passholders)
Antelope Valley Line
Stations: 10
Trains per Day: 24
Average Weekday Ridership: 7200
So, 11500 trips affected by the closure, for 5750 people.