There are people with families, maybe you want play more than just the Wii-centric stuff with your siblings and cousins while they're at your place. Also roommates and close friends who are in the same room with you.
Friend: That's a cool looking game, can I play?
You: Nope, you'll have to buy it separately on your console, and then go back to your place to setup your online pass with your online account so we can play.
Friend: Uh huh...
Online multiplayer shouldn't be the only option, both options should be accessible if the given opportunity presents itself.
But, provided the console is sold with 2 VR sets, wouldn't VR be preferrable to split screen for 2 ppl playing?