I do visit Detroit. But you may have a preconceived notion that would be someone's only impression of MI. I've spent a bit of time in much of the rest of the state as well. I've also spent considerable time with the yoopers. In fact, I think the only part I haven't been to is the Kalamazoo area. Still, I'm not sure why that's relevant to the discussion.
I think anyone thinking that we should have simple cars without a computer is being unrealistic. With the ever increasing pressure to improve emissions and fuel economy, having some form of computer on board to monitor and adjust as required becomes essential. So, that will never, ever happen in production going forward, at least not for sale in this country. As a side note, fuel injection will only become more refined; folks pining for carburetors are living in the past. The carb is decent device, but it is comparatively crude, inefficient and lacks adaptability. People once feared that the replacement of carbs with EFI meant the end of tuning and modification, only to find that it opened up all sorts of new doors for tuneability.
Now, where that's relevant to the crowd interested in open sourcing, unfortunately, the vehicle manufacturers have come to regard the software in the PCM as theirs (and not the customers). There have been suggestions that they should license the use of it to car buyer, and have been actively trying to find ways to protect the PCM programming from being retuned or "chipped" aftermarket. It would be truly interesting if vehicle PCMs were to go open sourced, but given the cost of the equipment needed to verify the effects of code changes (an emissions testing dyno lab), I doubt something like that would get off the ground too easily. Incidentally, the government regulates standardization of most codes. There are some that are manufacturer-specific, but retrieving codes and looking them up is easy. I'm not sure what the complaint there is.
One other note, regarding the "they don't build them like they used to" sentiment. You're right, they don't. True that some manufacturers have thinned out the sheet metal to save cost and weight, but on the whole, cars are built to be much more survivable then they used to. Yes, that means that collision repairs are maybe more expensive. But the medical bills won't be, in an apples/apples comparison. Which would you rather face? This video is rather telling (sorry, can't seem to embed it):
[video]https://youtu.be/joMK1WZjP7g[/video]
Notice how much more violent things are inside the cabin of the vintage car, compared to the modern one. And its not like both aren't totaled; having a more "rugged" structure didn't save the '59 from being a write off.