My personal feeling is that it's something that would be classified as "bells and whistles..." Given that the main goal of the FUSS project is to fix bugs, to the best of my knowledge (Correct me if I'm wrong), it just seems to be something that's unneccessary.
Mind you, as was already stated... Hotboot functionality can be removed fairly easily... Removing Dynamic Command Support is quite likely to be at least a slightly bigger pain in the ass, should a problem arise.
Portability aside, though, my main issue is reliability. I haven't heard anything very bad about it, but the fact is, the system that comes packaged with FUSS for commands is a system we've been using for God knows how many years... It just seems like toying with something with which we have complete confidence in its reliability in favor of something that's just easier to use, and not neccessarily more safe, is a mistake. DECLARE_*_FUNS are fairly uncomplicated... If there's a problem, it wouldn't be too much trouble to pinpoint. DCS, however, is more complicated... The more complicated something is, the more involved a solution will be if a problem arises that we'd never noticed before.
IMO, it might be defeating the purpose of the FUSS project entirely by creating the potential for more problems, not less, so I vote it not be included. I personally haven't installed the Dynamic Command Support system in any of the MUDs I program for, for one reason and one reason only: I know what I have works now, and it only takes me an extra 2 or 3 minutes tops to work with what I've got. I'm lazy, but not nearly lazy enough to run the risk of doing something that could cause me big problems in the future when I already have something that works just fine.
Heaven forbid this be taken as an allegation that it's not reliable code, but the fact is, we only know it's reliable inasmuch as we haven't had any big problems with it... But shit happens, and we all know it. That's my 2 cents, be it worth its weight in gold or less than a haypenny.