This could very well be it. However I doubt the aspect of entering "Dreams". Being able to enter a person's "Thoughts" rather than the "Dreams" would make sense. But I'm no Nolan so I'd rather leave it at that !!
Quote from Nolan:
“I grew up watching James Bond films and loving those and watching spy movies with their globetrotting sensibility.... We get to do that here, not just geographically but also in time and dimensions of reality as well. We get to make a movie that’s expansive, I suppose you’d say, in four dimensions.”