Certain IPA sub-styles have not lasted. Brut IPA, I really liked. Not to be found anymore. White IPA lasted less time. Session IPA had a moment but that momentum faded. But the king of busted IPA dreams was the Cascadian or Black IPA. Rare was the one that balanced dark malt with bitterness just right.
And maybe, Common Space has unlocked it with their new Citra hop version.