In the future, besides from the flying cars and robots that will clean your house, you can expect to work in RGB most of the time. A profile will be attached to your file, and whatever apparatus will output your file (a monitor does provide output as well) accordingly to the possibilities and limitations of it. Files will be flexible and converted 'on-the-fly' when needed. 'Under the hood' photoshops works in LAB, if I remember correctly, but I keep as a rule of thumb that I keep the hood closed. Only when things go really bad (smoke and all) I will open up things like that, and look like a pro doing so. Hands on hips and all. After that I expect things to go back to normal, because I know zilch about cars. But that is another subject alltogether.