There was a similar meeting in Haines.  This "planner" was asked a couple questions.

Question:  What will happen to people coming from Haines and Skagway who disembark and eventually find that one of the predicted landslides has occurred- blocking access to Juneau?

Answer:  That is a really good question, and one that has not been asked before (despite years of "planning").  I guess people could go to the terminal and hang out in the bathrooms- the only parts of the building to be heated- until rescued.

Can you visualize a boatload of people crammed into 2 little bathrooms at a ferry terminal, especially these days with all the hoopla over who gets to access which bathrooms?

How will foot passengers get to Juneau, 50 miles way?

Answer:  I guess the private sector will fill that need (even though it is my understanding that such has not occurred from the existing- and much closer terminal.

Given what you said,  I guess the "planners" view is : "Let them eat cake- and hitchhike."