To avoid confusion-
OT-Original trilogy
PT- Prequel trilogy
ST- Sequel trilogy
This is a bit of a hot topic but there's some debate that Disney targeted the wrong audience with ST.
For all the complaints about the prequels, Lucas directed them at kids (although Revenge of the Sith was somewhat darker than the previous ones) and he himself stated that Star Wars was for kids. Disney on the other hand went for the audiences that loved the OT because these were the guys that were very vocal about how bad the prequels were. However, these guys have largely aged up and just might have moved on from Star Wars (to a certain extent).
The guys that grew up loving the OT are in their late 30s and early 40s and long term, these people can't be the focus of Star Wars long term (it's also a big reason for the "politics" discussion going around because the PT was steeped heavily in the politics of war and security but with all aging fan bases, people tend to read things into things). It seems Disney didn't take into account that we now we have a very, very vocal group of fans that grew up with PT that now boldly state how much they loved them....a good chunk of these guys really detest the ST because it's done everything possible to move away from the PT. A lot of people (and Disney themselves apparently) are now just coming to the realization that the a generation of kids were brought in and grew up with Prequel era Star Wars.
So, what we have now is a very, very fractured fan base. Should Disney simply have adopted the Lucas approach and targeted kids and built up the franchise towards the future? Because targeting an aging fandom based on nostalgia hasn't exactly panned out as expected.