John was never THE radio voice - he was color commentary. He could still be there because he has a lot of plusses: he knows people in the pits, he has real Indy 500 experience, he's unlikely to embarrass the show, being from the States he has no accent, he really loves this race and its traditions, he's likable, etc.
See all 13 of my Indy 500-related reviews (books, audio and video) here:
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on December 5, 2013, 10:19 am, in reply to "