Where have all the soundtracks gone?

Do you remember the great soundtracks of years gone by in cinema? Not just movie score but actual tracks? When owning a movie soundtrack album was a big deal? Coming out of the cinema and thinking, the movie was great but I really have to get the soundtrack!
From 70's movies like Grease, Saturday Night Fever and Quadrophenia, through to the 80's with gems such as The Blues Brothers, Pretty in Pink, Dirty Dancing (yeah, I said it!) on to the 90's with Pulp Fiction, Romeo and Juliet and Trainspotting just some exampes of great movie soundtracks being produced at this time. Then came the millenium and movie soundtracks, with the exception of a few scattered here and there, (Once, Garden State, Guardians of the Galaxy etc) seemed to concerned with score rather than a good old tune, but why?
In modern day cinema it can be explained perhaps by the saturation of the big box office, popcorn loaded, special effects driven, movie where the eye popping CGI effects take precedent over picking a rollicking good tune to go along with it! The score in these movies, and others, can be breathtaking, mirroring the tone and heightening the overall experience but at times, the lack of that familar (or unfamilar) tune seems to deprive some movies of that unspoken supporting cast member - the kickass soundtrack!
Childrens movies seem to be the residence of the coventional soundtrack now, with most popular songs steming from this genre. That, of course is great, as, instilling that love of music in to a young audience can only add to their movie going experience but why not spread the love to all movies!
That vital component used so brilliantly in cinema years gone by is no longer relevant but, in my opinion, still yearned for! Just look at the movie soundtrack billboard chart from January 2017. It is packed with childrens movies, yet still contains the classic soundtracks to Purple Rain, O Brother Where Art Thou and The Last Waltz.
Not all directors have abandoned the principle of the impressive soundtrack however. Edgar Wright's movies always contain a few nuggets of brilliance and Quentin Tarantino always held the music of the movie in high regard, however, with his focus turning towards the western genre his focus and attention has had to steer towards an appropriate score for this brand of film.
Hopefully with the re-emergence of the musical on a small budget scale (Sing Street) as well as the box office, award winning platform (La la land) the conventional soundtrack will rise from the ashes once more and take its rightful place again in our car stereos, ipods and sound systems and we can welcome back that supporting cast member that has been missing from production for far too long!