Did you see Roethlisberger on David Letterman last night? He even thought it was not a touchdown, but he made the same point you did and said he would have run it on 4th down too - seems to have ruled out a field goal - so if THAT hadn't worked either, then it's 14-0, right? That's what I was talking about. Roethlisberger also let Dave shave off his "lucky" beard - see thread:
http://www.freerepublic.com/focus/f-news/1573391/posts
I guess that's about it for this season and this thread (although I'm thankful there was no American Hiroshima on Sunday too ; )
Your assumption that it wouldn't have worked on 4th down is dubious, but even if granted you must be a product of the US public school system if you think not getting 7 points can transform 3-0 into 14-0. Seattle had NO other scoring opportunity in the first half. The hold called on the third and long was a tackle. The refs didn't "take that one away."