Spare parts shortage for something that hasn't been built yet?
Sounds more like a case of brain-cell shortage from commentators.
"Google it, and do your homework".
Duh, must be true if it's on da internetz.
"...500 Backfires and 500 Bears".
Great laugh! Just where would you buy these from, Allan? Why would you not buy much more capable aircraft made right here in the USA?
You're confusing the reliability/safety of an aircraft with that of an engine. A 4-engined aircraft will ALWAYS be more reliable and safer than a 2-engined one, based on an engine-related problem...
The 'toys' for this concept already exist. The console system is not tied to one aircraft, new or old. The ability to see and be aware of the surrounding environment, navigate, detect and deal...