settlement building in game apparently will be limited to specific places or types of places.
i also doubt we'll be able to build all types of structures (like, dunno, a vault in an underwater cave or whatever)
so this will be where modded player homes still will come in.
about new objects: lots of modelers release resources already anyway, just that they're usable only for modders until now. so this might indeed be their big hour
what i'm wondering myself is, what that feature will do to player home mod counts.
for the modders' part, for somebody who just starts out, a player home is where what they can do (no scripting or other more advanced game systems necessarily involved) and what will be of use to potential players, meet, so pretty much everybody starts with a player home as their first mod (ok or some weapon retex etc maybe). this will not change much with the new features, so i expect release counts to remain pretty much the same.
more interesting i think though is the players' part: it's really odd, but people can't seem to get enough of player homes. like, in sykrim, even now, when you'd expect everybody would be sufficiently stocked with a home every 2 meters, it's still mostly player homes (even pretty independent of their actual quality) that hit high download counts. and i remember it being about the same for myself before i started modding: i took pretty much every nice home i could get, even if i'd not even enter most of them more than one time.
since i started modding though, this so totally wore off i can't even remember what on earth i wanted with all that real estate. i could just have me a friggin' palace with the front door in riften and the back in falkreath now if i wanted, but where my character actually lives is one (1) tiny hut in the woods, just big enough to fit in a bed and a table, but with a nice view from the porch.
anyway, what i wonder is if the building features will have just the same effect on players so they'll just not care about additional places anymore - depending on how easy or hard to mod/recycle dialogue features / voice audio will come out, maybe we'd all focus on quest mods then. but i suspect that's just wishful thinking :_)