Ok, I'll restate my theory, which actually contradicts much of this.
There isn't, really, a "renaissance" at all.
Vinyl carried on as a subculture all the way from the exodus from selling LPs, to the resumption a decade or more later. Record fairs, collecting, turntable and player sales, general sales of used records and hardware, specialist manufacture of phono stages, remained at, maybe not overly high, but at stubborn levels all the way through the supposed death of vinyl. It never really went away.
The vinyl LP is a cultural artefact. As such, the majority of users are still either from the pre-1990s user base or influenced by them. The renaissance as such is just new vinyl sales catching up with pre-existing use and demand. And some people are adding new stories and ideas to a long standing set of cultural values. It's those cultural values that are reflected in the current situation, not a pure sound quality argument.
We're over-obsessed with the sound quality aspect of the story. Especially when that supposed 50% of buyers who don't own a record player are taken into account.