I prefer playing sims as we do now.
However, I wouldn't mind a VR mode for those times I just want to immerse myself into the sim world I created and observe it, or play some mini games with my sims. Or it could be a stand alone VR game that imports and exports data to your Sims Game.
For instance, suppose one of the mini-games was ping pong.
You could export a room with a ping pong table from one of your sim's homes and play it in VR against one of the sims in the household.
https://youtu.be/UiLjKj7wL3I
Go to 5:10 to get past all this guy's commentary and imagine playing against your favorite sim instead of a robot.
What would really be awesome is to be able to select a group of your sims and play out a cooperative scenario.
Your sims react and play according to their traits and skllls. They would also build skills as you play, which would also transfer to your main sims gain.
I can't find an existing game that would be perfect for The Sims, but imagine being in some scenario like Star Trek Bridgecrew, working together with your sims that taps into their personality and skills for some humorous fun. It would be great to see them improve as they skill up, or you can start with the perfect team by how you select your sims for their traits, rewards, and skills. Of course they would speak in simlish and you would get subtitled translations.
https://youtu.be/ahmXrt8pSQA