A holodeck is part of our 10-year plan, seriously, sort of. But with the introduction of the Oculus Rift, we're thinking that 5 years is a real possibility. And after reading this post about Marriott teleporting you to Hawaii via an Oculus Rift, 3 years doesn't seem out of the question.
Imagine an immersive shelf test without setting up actual shelves. Or design testing large appliances with the ability to iterate and without the transportation headaches. Or testing floor plans brought to life. What uses can you think of?