“dominant technology permitted you to play 78s from the 1910s-2011 LP/singles all on one contemporary turntable”
While it may be true that you have been able to play LPs on the same piece of equipment for that span of years, it is beyond reason to suggest any but the most assiduously preserved specific records remained playable for a similar span of time. For unlike digital ones, physical copies are prone to entropy.
It may be as you say, of course, that technology shifts will make irrelevant our digital copies. Be that as it may, almost certainly none of your LPs will survive to 2110.
Computer harddrives are prone to crashing and CD-Rs are highly unstable (10-20 year shelflife tops). Unless the digital files are forever flying around the web, the content will disappear from the face of the earth.
I don’t see why an unplayed record would not still be playable 100 years from now (apart from warpage which still could be tracked, even old 8mm films like the Zapruder film of JFK can’t run through a projector anymore but can be scanned in to reveal information (including the imagery that extended to the sprocket holes)). The plastic groves aren’t unstable or “prone to rot”. Accetates can flake, yes, but pressed vinyl, not so much.
LPs are the only type of recorded music that dont require electricity to listen to.