I don't think that this is a trend back to a previous format per se.  I think this is a trend away from mainstream record stores toward speciality record stores targetting serious listeners and collectors.  The mainstream music business is, I believe, firmly shifting to the downloading/streaming digital formats with a continuing struggle to control and monetize the consumption of music.  Physical record stores have to provide something that appeals to the more serious consumers, and vinyl is a great fit.  They'll probably also focus on  offering services to chase down rare and obscure music for their customers.  But they'll have to build their businesses around a much smaller customer base.