My kids always play split screen games. Single player games don't get much attention. Online is not the same, in the same room is 10x more fun than with a stupid headset.
Now tv's are bigger most games should support 4 player split screen. I managed 4 player splitscreen on a 14" tv with Dreamcast's Re-Volt, tons of fun. Oh well, I'll keep playing 4 player split screen Terraria and Minecraft with the kids. I wish PvZ garden warfare had 4 player too.