It's the start of the end. He comes out of Super Tuesday without what he needed to achieve here if he wanted to make a serious case to be the candidate.
BUT, he didn't get as badly beaten up as many hoped or feared. He's proven to be a solid foil for Hillary, even if he wasn't a true threat... he continues to keep her honest and he continues to make sure she can't take her eye off the primary race.
He looks to have won Oklahoma, Colorado and Minnesota, along with Vermont. That's reflects well on him, even if he fell short of what he needed today. He still put up a great fight.