As someone who posts a lot of species lists, has one holder list and contributes to others - I see where you're coming from, and figured I'd add some thoughts:
1) I can't speak for everyone else, but I plan to continue posting species lists on the forum. They contain useful information that is often not covered or immediately obvious on ZTL - where species are located within a zoo, what species are actually on-display, whether they are temporarily off-exhibit, whether or not they are signed, etc. I would hope others recognize these values and do the same, but it's up to them.
2) As for holder lists: while they've been a great resource for the US forums so far, I personally have always felt that ZooChat is not the ideal platform for that information. Full updates can only be posted all at once, and start becoming outdated immediately after posting. The threads also become filled with countless minor edits and updates that interrupt and muddy more interesting discussion.
My hope is that US forum members can now use ZTL as a repository for bulk information, and utilize the website as a tool to create or further discussion on here