It's still fairly incomplete and I'm aware of a lot of the UX and functionality issues.
One idea I had that you might be thinking about already is making it possible to create different versions of timelines. That is, if I see a timeline, I could fork it and make my own copy that I could edit, i.e. remove some entries if it I'm trying to highlight key events or add my own observed events. That way, you wouldn't necessarily need to reach a consensus on a specific timeline, but you could still trace the lineage of different versions of timelines.
In terms of UX, I thought something similar to https://www.web3isgoinggreat.com/ would be a good starting point to allow for lots of information on the page.
Looking forward to seeing how this site develops! Best of luck.