"There won’t be a (Shirobako season 2 or Shirobako film adaptation). We do have enough material to create a second season, but the director’s schedule is packed for the next few years, so we wouldn’t ask him to direct it even if we wanted to. We’re not even considering the project as a possibility right now. It would be difficult to even produce another OVA."
Иными словами, т.к. режиссёр страдает хернёй, снимая всяческое убожество - никакого вам сиквела.