If the "Lindy Effect" was a natural law and not simply a shorthand to refer to enduring popularity, nothing would ever die out; its lifetime would continually double. Wikipedia notes this: Because life expectancy is probabilistically derived, a thing may become extinct before its "expected" survival. In other words, one needs to gauge both the age and "health" of the thing to determine continued survival.

There are lots of things in tech that we just stop doing one day. They get replaced by a different hot new thing. I'm sure REST will not go extinct for a very long time, but it definitely could go cold, just like its popular predecessors.