It might not. I’m sure there’s a way to get it to play back, but I’ve never seen a sequence preset of “HDV 720p60f”, the only thing close is the DVCPro HD 720p presets. I suppose you could also try creating a new HDV720p30 sequence and change the editing timebase to 59.94? I doubt that would help.
I’m guessing you tried this already, but have you dropped one of the clips into a DVCPro HD 720p60 sequence, rendered and then tried to play? If that doesn’t work, I guess you could export from that sequence and import it back in?