The Star Trek post-apocalypse could be interesting, though I think it would receive criticism from many for not being 'Trek Enough' because it runs the risk of being too dark. In many ways, that seems to be what the novels are sort of going for to some degree, though at least not as extreme as actually having to rebuild the Federation after an actual collapse. Still, many of the themes of rebuilding after the Borg attack in the Destiny books, crossover with themes that would likely be explored in a Star trek version of Andromeda.
For those that like that idea though, you should check this out: http://www.st-minutiae.com/misc/restoration/index.html
There was also a proposal for an animated series (possibly web-based) that featured similar themes.