How do you think Joy Division's first US tour would've been (other than short)?
I suppose Ian probably would've had trouble staying on stage and singing like at some of the later JD shows. No fun for anyone concerned. In hindsight, it probably wouldn't have been all that fun to see: "Welcome to the atrocity exhibition..."
Self-limiting factor: How sad it is to think that the forces that inspired such wonderful music would be the same ones to ultimately lead to the end of that music.