Probably never. I wish the situation were different, but it is a realistic answer. We still haven't seen the LP-10 window. After the next NCE window and the frozen Translator applications are settled, there won't be much left.
Maybe if enough people would write the FCC, they might consider expanding FM radio into TV channel six, which will be open frequencies in most of the country.
Oops. Reality check.... They will sell it off to the highest bidder. It is all about money.