“American Idol” will finish its season this month with a whimper. Last night’s half hour results show hit an all time series ratings low: 6.92 million total viewers, with a 1.5 rating in the key demo. It ranked third at 9pm after “Two a Half Men” and “Grey’s Anatomy.” It was the 7th most watched show on broadcast TV for the whole night. The “I Heart Radio Awards” beat it in the demo, but not the audience. The Wednesday “Idol” did slightly better. But it shows that with any competition now,”Idol” is an afterthought for viewers. And for youngish audience, the interest is minimal at best. Two more weeks and the agony is over. Then Fox has to figure what the heck to do next.