[editor-surveyor]

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That particular “meltdown” you mention, has happened several times already. That is why it is way back in the 3rd seal, not in the future, although more of it can’t necessarily be ruled out, Deflation is way more likely in our future than that kind of inflation.
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[Jan_Sobieski]

The term for multiple fulfillments of Bible Prophecy is called Midrash. Example: Hosea "...out of Egypt have I called my son" fulfilled multiple times Abraham, Moses, Israel, Jesus, and ultimately "all of us must come out of Egypt". The ultimate fulfillment is called the Eschaton.

I do not argue that parts of Revelation 6 were fulfilled previously. But there will be a final and ultimate eschaton in the Great Tribulation (70th week of Daniel)