Does anyone actually believe any of the critical electronics modules needed to keep these cars running will be available in 30 years? The only way to keep them running will be to heavily modify them with whatever technology exists at that time. An electric Blackwing “restoration” seems like a real possibility.
What is the failure mode for these electronics? I can think of capacitors leaking and solder fatigue. I'm no electronics tech, but they both seem like easy repairs with caps and solder that will always be available.
I have a couple of 32 year old Hondas with computer controlled engines. Part supply from Honda ran out on most parts about a decade ago. Getting parts has become tricky, but electronic components are probably the least concerning repair parts. They are exceptionally reliable (vs, say, a fuel pump) and inexpensive and available at junkyards.
Capacitor replacement kits are available on eBay for the ECM, but I doubt the replacements are as good as the ones Honda used. Someday I may replace the caps, but I've NEVER heard of or seen a Honda ECM go bad. I do have a working spare ECM I bought on Craigslist just in case.
There's also a computer under the dash - these are almost pocket items at the pick and pull - I probably have a half dozen. Never seen one go bad, but the Acura ones have more features so those are the ones I pull.
The speedometers actually are a weak spot - they're full of electronic chips, but I think the failure mode is solder fatigue. At any rate, I have a stash and swaping the circuit board on the back is an easy fix.
There's also a main relay that has solder fatigue issues that prevents starting on hot days (intermittent non start). Mine lasted 20 years before acting up. After a solder reflow 10 years ago it has been trouble free ever since (although I do keep a spare).
Unlike economy cars that are driven into the ground due to their almost zero value at 20 years old, I think most Blackwings will be well cared for. The ones that end up in the junkyard after an accident will surely have all their electronics harvested and stored inside the junkyard office. Barring an accident that totals it, I'm 100% confidemt mine will be on the road in 30 years (my actual concern is mag ride shockes and rubber suspension bushings - those have finite lives and will almost certainly need replacement within 30 years)