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Would the change, assuming the old domain redirects to the new, hurt the site's google rankings?Certainly for local searches, and to some degree for all searches.
Generic Country Code Top Level Domains (ccTLDs): Google treats some ccTLDs (such as .tv, .me, etc.) as gTLDs, as we've found that users and webmasters frequently see these more generic than country-targeted. Here is a list of those ccTLDs (this list may change over time).
.ad, .as, .bz, .cc, .cd, .co, .dj, .fm, .io, .la, .me, .ms, .nu, .sc, .sr, .su, .tv, .tk, .ws