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Nothing, since they've been running their laptops without issues (it would have been all over the news if it was some widespread issue) for 2+ years.

At some point in the near future Apple will package the microcode fix in an update, and that will be it.

I've run into an issue where switching users causes a crash on my 2016 MBP. Many more people are having this issue, according to the Google.

Also, up until the end of 2016, Apple didn't use Skylake processors, so it wouldn't be 2+ years.

Probably already done since this was fixed in April/May by Intel. There has been at least one update since then.