I actually like Heyman's old-school defense of his "no" vote. If you accept wins above replacement or something similar as a pretty good measure of overall value, Bert's a slam dunk. If you don't (Heyman doesn't), it's a harder case in large part because Bert simply was not revered as one of the giants of the game when he played. (Although I suspect that if Bert had been a Yankee his whole career, Heyman and others like him would have remembered him much differently.) I've heard Bert say that he himself was essentially convinced of his hall worthiness after he stopped playing.
I think he'll get in, and I certainly think he should, but Heyman does a good job putting out the nay side of a very interesting argument.