My guess is that... we'll discover that the future is also the past and the Forgotten Realms is a circular history. Thus, the Sundering is the last Realms Shattering Event because it's also the first one.
And apparently, there was a ''Sundering'' in the ancient past of the FR:
Search results for 'sundering'History of the Forgotten Realms
(Might not be news to serious FR fans, but it was news to me. I'd XP you Jeff for probably being right, but I "must spread some..." yada yada yada)
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