Hi! New to the forum as a user, but have been using it a lot for troubleshooting and appreciate what you all do! I'm thinking about buying an Imac. I currently own a late 2013 Macbook Pro 25 inch, which I preferably would like to connect to my Imac sometimes to get a bigger screen. I've read a lot about the current Imacs not being able to use as external displays, and that this is connected to the version of the current thunderbolt and displayport. If Apple were to upgrade thunderbolt and displayport, would that make it possible for me to use it as a external display? Or is the new Intel-GPU also necessary for this? Is my Macbook Pro to old to do this in itself and should I just try to find a good pre-retina Imac instead?