I'm not so sure of that. NDSU wins FBS games already, we would just need more players for depth, etc.
The "growing pains" of moving NDSU to somewhere like MWC would likely be a whole lot less than the pain of rebuilding a losing FBS program, which are typically the schools looking to take a chance with an FCS head coach. The successful ones either aren't looking for a new coach, or are looking to reload with a successful FBS coach. Success breeds more success, and a failed program is very hard to turn around.