If to delve more into speculative visions of the future, there is probably no bigger cult influence for our ~generation, than the movie and a concept, provided by the brand of The Matrix. If people actually ever migrate - in some form or another - to a virtual reality, in an attempt of artificiating an eternal life, while believing this to be a shape of sentient, post-organic "life" {this is actually scary}, what would happen to these, in case the sustainability of technology supporting such an "eternal life", suffered? Would such seized identities even realize their fate?
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It is still unclear to me whether your concept of 'low tech future' does describe primarily a "fork" of the actual or reasonably expected, earthly reality, such as most 'post-apocalyptic' scenarios do - or is it a vision of organic evolution, describing an entire, parallel - perhaps extraterrestrial - reality, which has come to different conclusions and different status quo of technology?