In addition to the high tech ideas presented, and the Boxes and Wrapping paper answer that hopefully will ALWAYS remain true:
Consider the fact that at the technology-level you imply, just running around outside may be safer than it is today. Especially in cities, just playing outside has been reduced by more than the availability of computer games and TV.
The other part of it is the fact that streets are busy, parks sometimes far away, the next playground may not be safe to reach for kids alone, and/or be dirty, possibly to the extent of being dangerous.
So, parents would once again be in a position where they could say "how about you take your [vehicle of choice] and go to the [playground, lake, park...]" when the little kid is just booooooooreeeeeeed again.
Yes, they may take along their electric pet-dino, but I think when given the opportunity, kids will happily be outside climbing, running and meeting friends no matter the tech-level.
In the case of worried parents just have a drone follow the kid around... and the kid will be annoyed to NO end by it ^^.
Have them play "ditch the drone" and try to hide from it.
Inside-play: holographic stuff, yes, but also occasionally messy stuff. Kids will not only be drawn to images, they will drawn to textures, tastes, smells, too. IF they are being provided.
If you do not want to display them glued to a future console, try to imagine having one of the whiny, console-addicted kids at home... and then the console breaks ;).