This revolves around the very sensible idea of co-locating initial naval training for Officers and Ratings. The problem lies in a required capital spend to bring either BRNC or RALEIGH upto the required standard to take the other group of people.
There are some significant questions regarding the sale of BRNC - it doesn't seem as simple as flogging it on the open market for oodles of cash. Equally, there's significant amounts of space at BRNC that could fit in most of the output of RALEIGH, but a large capital spend would be needed to get it to the required standard.
I don't know many (serving)Naval Officers who would object to the co-location of training, retired Officers are a completely different breed.....