A view that I have posted elsewhere is that there is a whole list of *possible* disastrous accidents that could result in multiple injuries or deaths. The only difference between these and the monorail incident is that they've not yet happened. If I know this, the company and its legal department certainly know it. (Just think of the changes made at
Disneyland's Tom Sawyer Island a few years ago as such an example.)
For instance, the possibility certainly exists for a serious accident involving a Water Mouse and one of the other craft on the Seven Seas Lagoon. Would it, by analogy, make sense to therefore remove Water Mouse rentals at the two resorts on the lagoon?
If Disney is going to take drastic action because of *possible* accidents, it does not serve them well to wait until *after* the accident has happened to take action. In fact, one could argue that the corrective actions taken in the aftermath of the monorail tragedy may make it *less* susceptible to future accidents.
That is why I suspect that the closing of the front cabin is based on something more than just the potential for future accidents. The emotional angle is my best guess.