Ainge was an incredible athlete for his day and time. But would he be today? I'm not so sure. He is a lot taller, but I think he would really struggle to guard a guy like Jimmer who I believe is much quicker than Ainge was.
Who knows though, just speculation on my part. I would still probably go with Ainge and his all around game, but I don't think it is as big of a blowout as you suggest.
I would put the 2011 Jimmer team vs the 1981 Ainge team and I think they win despite having less "NBA" guys.