Follow-up: In summary, all is now well, but it took several hours of effort, detailed below.
Details:
I ordered and installed a new Hue Hub. Migration from a v1 Hue Hub is no longer supported, so I had to start from scratch. I had issues getting the new hub connected, so I called Hue support, which was very responsive, through what followed was VERY tedious and consumed the better part of a day.
I couldn’t release my Hue devices from the old Hue Hub, so I had to register them with the new Hub manually by serial number, which required removing every bulb and entering serial numbers one-by-one in the Hue app. It was particularly difficult finding serial numbers on Hue Light Strips, which required another call to Hue technical support and quite a bit of subsequent effort dismantling and then reinstalling the strips.
After adding all my Hue devices to the new Hue Hub by serial number, I [re]associated the new Hue Hub with SmartThings, deleted the “old” Hue device registrations from SmartThings, added the newly reregistered and reconfigured Hue devices, and amended all my SmartThings rooms, automations, and routines to return them to their former functional characteristics. Everything is back to normal … for now.
I expect I’ll have to update my v1 SmartThings hub in the not-too-distant future, so I’ll have to endure all this again and a lot more downstream, since I’ll probably have to start from scratch then too, but this time for EVERYTHING instead of just my much more limited set of Hue devices.
I’m an IT professional so I’m better equipped than most to grapple with these sorts of issues, but my heart goes out to more typical consumers who assume smart homes are an appliance-like convenience. The products usually work well when new, enticing you to invest and expand, and then it all comes crashing down around you and your family as the landscape evolves.
Caveat emptor!