We have Sony DXC-3000 cameras in our studio that were installed in 1989. They're still plugging away. I'm not sure its unusual to have television equipment for a long time. Its not the same as consumer equipment. In fact I think the only reason there's been a big wave of replacement of studio equipment is due to HD coming in. Otherwise a lot of places would still be using their mid 90's (or earlier) vintage cameras.
David
