It's
possible that they're being considered, but it's unlikely that they're being seriously considered for anything in the near-term (within the next ten years). Soundstages are easy to "relocate" because they're largely just empty space. There are other elements to them and some of the nicer ones have built-in dressing rooms or other support facilities, but the majority of it is empty. Easy to put up and easy to tear down.
For something like the Brokaw New Center (KNBC and Telemundo Studios) and the Carl Leammle Building (Building 2160), they'd have to either relocate or recreate the whole breadth of the facilities offered in those buildings to keep from losing functionality. They may expand that way in the future, but it would be a very long time coming. Plus, with how the lower lot is laid out, actually accessing that area from the rest of the park, once the buildings are demolished, might prove difficult.
Also, Google Maps isn't the best resource when it comes to building information. I recommend the map found
here, since it has the most complete information provided by Universal.