They are looking at adding in family sharing at some point. All of this is brand new, so it takes time for all of the changes to take place. Hopefully they will announce something this year.
As far as your listing the PSVR as a solution, I’m pretty sure you have to pay for Playstaion+ to enable family sharing, and your family can play multiplayer on that PS4, so you would still need to buy another PS4, and that family member would have to have PlayStation+ too. So, that might not be the best example.
To simply play multiplayer on your Go, all you had to do was buy another copy of the game.