I want to know the answer to the following question:
What happened in 2007-2008 that had a drop in viewers for all networks?
All the background I'm provided with is that "Overall ratings for the season were down 10% from season six, which is in line with the fall in viewership across all networks due in part to the 2007–2008 Writers Guild of America strike.". Is that enough to answer the question?
Answer: yes