I'll update here tomorrow with the results.
So, I took it in today. They wanted to replace the whole computer (for $2179, not $2719), but given that my computer was working perfectly fine prior to the update, I'm somewhat skeptical that the hardware is suddenly "broken". The way I see it, there are one of three problems:
1. The latest SW update has a compatibility problem with the hardware in my car - some component that I have that they didn't account for in their testing matrix. This is not the first time something like this has happened. When I got delivery in 2018, I had two times where software updates failed to install and I had to bring it in where they went through a bunch of manual steps to finally allow my car to take an update. If this is the case, I do NOT want to pay to have my computer swapped for something that is a failure on Tesla's part.
2. It's possible there is a failure in my hardware that only shows up during updates. For example, most firmware updates (and it was a firmware update that has failed) that I know of work by loading the new version of the firmware into a bank of memory while the old version is still active; the new firmware is tested in place (usually just a checksum or sha hash) and if it passes, the banks are swapped, and the bank that held the old firmware will now be where the next update lands. So I could have a bad bank of memory or something similar that only becomes an issue during updates.
3. I have some hardware that was broken in a way that wasn't a problem for the previous version of the system software but now shows up as a problem with the new software.
I'm willing to pay for a computer swap for cases 2 & 3, but not 1. After talking with their service people, we're going to see if they can image my current system with the previous version of the software using a direction connection instead of OTA. If they that, and it works, I'll pass on this version of the system software and wait for the next. If that fails, I guess I have to decide if it's worth it to pay to have a piece of hardware replaced that Tesla is obviously no longer supporting.
I'll know some time next week when I bring it in for for the re-imaging.