onion: Agreed, the LARS task is a significant part of the DTVA ATC effort. But "busy" is always a relative term and I would be surprised if traffic levels around DTVA anything like matched those seen in the SE. Additionally, DTVA's LARS coverage is almost completely overlapped by Leeming and Newcastle so while it might be valid to argue for local knowledge etc etc, the accountants may well see a strong case for ditching LARS.
In any case I'm not convinced by the "local knowledge" argument. Take RAF controllers. They get posted every couple of years and I can't recall anyone ever suggesting that they provide a defective service because they haven't lived there long enough.
NS