For some they might be reaching for quality viewing going to blu ray ... but for those like myself it would the lack of a wide broad field of movie or tv series titles being available on any one streaming service being the reason to look for content elsewhere.
I miss video and dvd rental stores, more so video stores for those in my parts held a far greater range of titles, and generally generous weekly rental terms.
I'd definitely have a bigger dvd collection but for the fact many tv series and movie just didn't become available in Australia due to production issues like music rights.
Baring cooking and reality / docu type shows, I also think the change from where many tv series were 20 plus episodes per series has finally had an impact of viewer consumption.