Well, the first issue is UND is violation with their settlement agreement with the NCAA if they don't retain the trademark of the retired nickname and logo.
Second issue would be setting back whatever strides in rebranding (regardless of how small or large) and giving in to a very vocal minority group who mostly support the hockey team. Not saying there isn't a way to come up with a solution, but the Sioux Shop still sells Fighting Sioux merchandise. While the selection is intentionally limited, would be curious on what the sales for the Dacotah Legacy Collection actually is.
As to your point about people wanting to get something back, sure that is definitely fair and I agree with it. However, if you want talented rosters, the current set up requires funds to help pay for them. At this point, the return (is hopefully) winning games.