Quoted from
Wikipedia:
"After the show was moved from NBC to ABC, the broadcast format for new episodes changed to high definition. John Inwood believes that older episodes will be re-released in HD as well. He protected for 16:9 aspect ratio from the very beginning so episodes could be aired in HD format when the market evolved. In his opinion, footage from the Super16 camera was not only sufficient to air in HD format, it looked terrific."
So there's hope the show will be re-released in HD format. Although you can't tell if it'll only be on TV or on Blu as well...