The article mentions the use of inflatable housing inside. Seems like a wise move given we have so little experience with their stability.

If they've survived this long, then presumably they are very unlikely to collapse on their own. That is, settlers would only need to worry about collapse cause by their own movements.

The odds of them being 'on the verge of collapse' are relatively low in my thinking. Unless there is some process that takes them to the edge and then stops that we don't understand. Otherwise, they are likely to have either already collapsed or be somewhat stable.