That's really rubbish. A huge step back from PS3's openness. Do you have to be online to play these download games on another machine? I suppose they could have an optional online permission aspect to enable games on consoles (let's say same IP address to prevent game sharing).
How does XB1 currently handle multiple consoles+multiple users? AFAIK there's been no progress on the original, abandoned game-sharing policy.
The PS3 setup was perfect - apparently the PS4 setup is much like X360. The 'advantage' of the system is that you can access all your games on any PS4 so I could visit a freind, d/l one of my games and saves - play and then when I get home continue.
Not sure why I couldn't do this on PS3 :S
And to answer 'how many PS4s do you need?' I would say that I don't need many 'today' but I ended up with 3 PS3s in the house and that was a pain at times (one in front room, one in bedroom and one in kids room). I presonally think the PS3 system had a better 'balance', 5 was too many and 2 allows people with more to at least have a little flexability when switching which console they use whereas with PS4 it's every time AFAIK.