Should it be necessary to have a PS2, PS3 AND PS4 hooked up all at once to play?

[TheLastStarFighter]

I really like BC. Right now I switch between COD and Xenonlade often on my WiiU. That said, BC on PS4 would have been a major cost so they were wise to leave it out. And I think Sony is going to offer a great BC solution using cloud gaming. The only problem is you'll have to pay.