The thing is though, the backing for "No" doesn't feel that strong to me. I recognize there is an argument to be made for it, but I genuinely think 6 is the best amount, and doesn't even cost resources, or at least more than they'd already do with all the other permutations of this game. That, and it does not stop anyone from playing with 4 or 3 or 1 person, but doesn't make mods the solution to one of the most talked about issues.
I am a big NO on this for the actual game but obviously people can mod whatever they like. Between on the temp party members and familiars/companions I think its a lot to manage.