You're good, its a fair question. Forgive me if I sound like I'm doing some "man-splaining" here, but I'm assuming you are younger and didn't live through what happened in the aughts and early 2010's that led to this.
Many would argue we were well on our way to becoming that kind of dynasty until Krakaur's libelous book and the local media and our own administration aiding him in tearing down a lot of the strong foundation that the U of M had built in enrollment and in football. We had won a couple of national titles and were in back to back championship games. Pflu was, in my opinion, an amazing choice to lead the program at that point and I was really excited about the future.
As many have pointed out, NDSU also had WAY more funding for their football program, got ahead of us in facilities, and has the proximity to Minneapolis' recruiting grounds. They have an absolute shit ton of oil money that poured into the program when the oil boom hit out there.
In 2015 they were also allowed to start paying "full cost of attendance" to their players in a way that the state government in Montana has not, so they were somewhat ahead of the NIL curve and were essentially giving kids an additional $3,400 per semester to cover their transportation and other items while the Montana schools were not allowed to do so.
Lastly, they had some damn fine coaching and institutional support.