NDSU is not leaving their current level anytime soon. They come to the IAA party waaaaay to late. To have been positioned to move to IA NDSU would have had to have moved up to IAA in the late 70s to early 80s, And then move to the WAC in the same time frame that Nevada and Boise moved up in the mid 90s. In the same time frame you also had Marshall, Buffalo, UCF, USF and Troy moving up and a few years later schools like FIU and FAU started football who started in IAA and moved up at or around the same time WKU left the OVC for the Sun Belt.
With the WAC going away and MWC full there is no place for NDSU to go. There is no viable options for them at all even if they wanted to move.