IMHO it's mandatory Sony evolves its "family consoles" management: even more, now with their release of the PS4 Pro I know many peole (me is one) with a PS4 and a PS4+ together in the same house.
Sony - like Microsoft, Apple and the like - should offer the ability to tie PSN accounts/PS4 consoles together under a single household or as “account families” — so to easily share digital copies of games, overcoming the limitations of which specific console each digital title needs to be played on.