Also, maybe mention the role of streaming video services like YouTube, which didn't rely on plugins. Streaming was more efficient and didn't require installation, unlike Shockwave.
Potential to add a timeline: 1999 - Macromedia releases Shockwave; 2000s peak usage; Adobe acquisition in 2005; decline starts around 2010s; end of life 2020. shockwave plugin
Check for any common misconceptions. For example, some might confuse Shockwave with the audio format. Clarify that it's a web plugin, not a file format. Also, maybe mention the role of streaming video