The concept is great. One major thing stopping me from trying this out though is ease of putting something I see to within the CMS (which I am feeling like conceptualizing as?). A browser extension would go a long way towards helping this.
A separate point since I see you're interested in YC and similar startup culture, I know this was made as a deep dive, pretty detailed explanation of using Trove, but some small details can be skipped over because when you've got the benefit of both visual and auditory media, people can jump to answers far quicker than you can say them. e.g. explaining the concept of your top Troves. It's readily understandable without explanation (maybe even without a mention as people see it in the hotspot of the page as you scroll!) and at least personally, I prefer to see things and interpret them in videos as if I was scrolling through the page myself.