Frankly, I don't see how any change in voice makes a difference. The lines he was supposed to say came from Bungie writers, and there in lies true problem. Many of them made ZERO sense in any context.
English
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As far as I know the script isn't being rewritten, just rerecorded, and North does sound like a squeakier version of the Dinklebot anyway. Would just be a nice nod to a guy that got a lot of shit for something he hadn't really done before :) Dinklage is a great actor, Game of Thrones is evidence of that, just be nice to remember he was part of Destiny's beginnings.
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They are changing the lines with the new ghosts from start of story to the end. Plus ghosts do more now read out things and have abilities