Hi Geekgirl,
Thanks for commenting.

1. I do realize that and that is the reason I mentioned that the engineers will need time to look into the code to get used to it. (Because they will be coming probably from Tron)
2. I estimated that at least the current US userbase, German and Canadian Userbase which are visible from the user % would move to the community-based chain. There should be of course more, but that is the reason I mentioned at least 30%. The reason why I am counting it that way is based on the reaction from those communities.
3. The rational decision you can take is either to give up your money or invest in the product to increase the value. If Justin would give up on Steem then we will have no fork but also no money on our chain. Because we would not even have a weak Steemit Inc. nor developers or marketing. Justin could just decide to give up this project and send his stake to @null.

At this point, I find it hard to believe JS is interested in contributing to Steem development, listing on exchanges, or onboarding, etc.

Yes, understandable but that does not mean either it is a fact.