Well, it looks as if BL 14 will be a mid season show for NBC with The Voice taking it's usual spot on Tuesdays at 8pm.
Biggest Loser is an aging series and NBC has a lot of them but it is hard to replace that many shows when they all still have huge followings. The Voice was a huge ratings hit for NBC and a very good challenger to Fox's American Idol. I personally don't mind Biggest Loser being on only once a year. In fact putting on BL on come January may be a stroke of genius and inspiration to all of those who want to lose weight after the season holidays.