With the benefit of hindsight two huge red flags: (1) the purchase of Donnington Hall - absent special circumstances (and even at a give away price it would make more sense to flip it) what serious manufacturer purchases a non industrial building and then "adapts" it for industrial production; and (2) no serious attempt at selling in the US market - apart from being the biggest consumer market in the world - the biggest market for the original Commando and thus the largest legacy market for a Commando "themed" modern Norton.
Spot on.
The complicating factor in your item# 2 is that from day one, owner complaints doomed Norton's attempts to succeed in the US market.
SG needed to squelch the complaints by rapidly addressing them and resolving them.
Some of the problems required redesign, or replacement of components to resolve them.
SG decided instead to spend funds to try and recapture old glory at IoM, and design new, modern, unneeded models.
The money would have been better spent redesigning the 961 to bring it up to snuff with the expectations of the motorcycling public.
A 961 as reliable, and easy to maintain as a Honda would have easily sold by the truck load in the US.
Water under the bridge now, unfortunately.
Now we'll have to wait for the next victim to acquire the Norton marque and try again.
It's a bit like Groundhog Day.