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It is worrying. A possible work around for the remaining 32-bit systems would be a patch to switch to using an unsigned 32-bit integer for time storage, however this will only work for systems that don't need to deal with dates before 1970, but pushes the problem back to 2106.

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You also will have to be absolutely sure that those systems will never run code that compares timestamps using a signed 32-bit comparison. That means vetting all the code, not only the OS.

Even for devices where all the code is in ROM, that can be difficult. Source may be lacking, or there may be binary blobs bought from companies that do not exist anymore.

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