When context changes, so do the prospects of these ideas.
Youtube wasn't the first video streaming service but it was one of the first for the DSL era when people could watch video without lengthy waits.
AI companies repeatedly failed until enough things, specifically data and compute were at enough scale to deliver.
Advancements in battery technology made electric cars practical bucking the trend of decades of failed EV car companies.
So many things - contactless payment, touchscreens, even LCD panels, these were lousy and impractical for decades.
Attempts at mass adoption of handheld computers, now called smartphones, started in the 1980s. Without high speed mobile networks, high density color LCD screens, reliable geolocation, these things were necessary to make the handheld pocket computer something that everybody has.
Even online grocery delivery services, now common place, had its start in the catastrophic collapse of WebVan in the 1990s. Cell phones, the gig economy, mature e-payments, these were all needed.
You always need to look for the context change and how that can untar some tarpits.
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