When I worked at USF in the late 1990's, the nick studios were mearly a shell. The productions were down to a skelleton crew. The main thing that was taped there was the breaks with games outside the studio. Occasionally nick would have a pilot filmed there to save cost and to have the live studio audience reactions. But going to a Theme park to watch a TV show be taped was no longer accepted by guest who are paying $50+ to spend 5 hours inside watching a taping.
The Universal Production Group has approximately 6-7 soundstages (revised now 8-9 studios with the acusistion of the paramount soundstage). Film there in the 90's included American Gladiator, TNT wrestling, now TNA wrestling, battlebots, a heath channel. The facilitys were designed to be a real production studio and would allow guest to see productions but with the rank group merger with universal the parks began to compete with disney more than just the MGM studio portion of the park and to add more attractions and abandoned the tour trams.
The studios will remain on the property and can be used for attractions if GE desires. I do not forsee any attactions going into those buildings soon. One example of a conversion of a studio on the USF property is Kong, now featuring the Mummy ride. The building is actually built as a soundstage and then converted.
One unique feature of all the soundstages on USF's property is they are built to withstand a Catagory 4 hurricane hitting orlando and still stand with there own power generation. As well as many of the buildings on the property. The security command center and the vaults are all built to the same standard to protect the property and assests.