Hm... I briefly was a part of the Google Toolbar team back in 2008. How would it be relevant today? All of the features that I remember, are now a part of the browser itself (whether it's Firefox, Safari, Edge or Chrome/Chromium).
That said, the eSignature for Google Docs feature would definitely benefit from some strong (preferably, legal & irrevocable) commitment to keep it alive for 40+ years or more. Otherwise, I fail to see how it's useful.