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If google has the noarchive against it, will it come back more and be more responsive with it's ranking allocations for serious page changes - working on the lines of opto-ing for google ?
While I read different opinions on this forum, my view and experience is that nonarchive tag has nothing to do with the relevance of a given page and, while respected by Googlebot, is ignored by the ranking algo.
Several moderators who's opinion is held in high esteem feel just the opposite. You make the call, but approach with caution.
My suggestion would be to try it on a few high ranking pages that have had stable high rankings and see what happens to them the next update. If no problem...go for it - else it's a judgement call.