Well, if you look at Nikon DSLRs: if you are shooting landscapes or portraits and are ok with the ergonomics of your gear/not printing _really_ big posters: your D750 is still state of the art (6 years old), so why buy new. What is a little bit disconcerting is, that everyone is jumping the full-frame wagon and not going the niche/mini-series way, they should probably go (this might lead to a disruptive change with a lot of knowledge lost in bankruptcies – which would be bad).