If you consider full dive an extremely immersive VR experience then probably but if you consider it indistinguishable from reality than I think more like 20 years minimum. To achieve something indistinguishable from reality it will probably require BCI which are ethically iffy. I think maybe we'll begin seeing some prototypes for full-dive in 10 years but due to the monumentality and philosophical/political ramifications I think it will take another 10 years or more before people actually start using it.