NBC wants to make as much money as passable...
esp when the studio makes more money then the parks do.
right now they are redoing the older sets, moving sets they use more to favorable areas. and making room for other profitable ventures, which might also be used for taping and filming.
remember, this is a 10 year plan... so they will be moving everything slowly... first move stages then sets then make room for the new stuff.
it makes sence since their studios have been booked to capacity.