I'm hoping too that there won't be a need for mod support, but mods can do so much more than plugs the gaps on an unfinished project. One of the inviolable rules of the internet is that a game's first mod is a nude mod, but there's so much more scope.
For instance, using the Skyrim example yet again, player houses, companions, new towns, new dungeons, texture packs and creature packs are just a few of the many areas that have been modded. Take a look, here.
This isn't going to be an elder scrolls game with infinite quests, WAIFUS and all that...
check out games like PST, only mods for it, are Widescreen mods, and some that fix some stuff
I do realise this isn't going to be an open world game on the scale of an Elder Scrolls title, but doesn't the fact that games like PST only have widescreen mods available for them, actually support the idea that we should be requesting mod support at this early stage?