And interesting topic. Well thought up.
I think we will. It may not be exactly like it is on Star Trek, but I do see this being technically possible in our lifetime. What I find more interesting is how holodecks are featured culturally. Video games, whilst they have gained some serious stock and are more respected than ever as a mature pastime, aren't yet respected in the world of culture as perhaps they should be. The "holo-novels" in Star Trek, which are basically like role-playing narrative games, are a cultural expression held in no lower stature than classic novel would be today. I know that video games will be respected like that someday, but I would like to think that time is closer than how long it'll take for technology to get that advanced. They also use holodecks for training, experiments as well as recreation, and I see that in the future of gaming technology as well.