What I'll miss the most is the cross-save. My four year old doesn't let me sit in my office and play PS4, but she has no problem with me playing something on my Vita. So I'll sit on the couch and play The Show. I was able to cruise through my RTTS this way.
Remote play doesn't work well in my house because my PS4 isn't wired (yet) and its really hit or miss depending on who is home and what they're streaming from.
Sad day indeed.