One indicator I'm keeping an eye on is the AO3 scale, which is something of a guide as to the impact a movie has had on online geek pop culture (albeit on that's only really accurate after about the mid-late 2000s when AO3 came online).
The AO3 scale is, simply, the number of fanfics inspired by a given property that are published on
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Obviously it's a bit of a lagging indicator (writing takes time...) but it's a slow start. We're sitting on 32 after the opening weekend (most of which concern Edgin gettin' it on with either Xenk or Forge, but that's AO3 for ya). Other films with 32 on the AO3 scale are ... I Robot starring Will Smith from 2004, or the legendary 2012 flop John Carter. but, when i checked on Saturday it was only 6, so we're making progress.
By comparison, John Wick (all the movies) is in the 1400s (lower than i expected, perhaps the fanfic-writing demographic and the lotsa-guns-action-movie demographic don't overlap too much), Avatar (likewise, both films) is in the 3100s. The really big dogs like Harry Potter and the MCU are in the half million region,