I go through suburban station (the one closest to the Westin) every day, and during the strike it is only really crowded during the evening rush hour, and that is only because Septa management, in their infinite wisdom, is making people line up and wait on the concourse level for their train rather than going down to the platform, so that the concourse is a complete zoo but the platforms are deserted until a train arrives.

If the strike is still on when the OP is in Philly, keep in mind that the 20 minute travel time estimate for a cab to PHL no longer applies. I would allow at least an hour.