I don't see it as a left-right issue of contention, rather one of a statist vs. individualist perspective. There are left-leaning folks who strongly support the 2nd Amendment, and there are right-leaning folks who are all-too-friendly to those who would strip it bare.
All that said, it certainly seems to me that should the Heller/MacDonald majority evaporate, the SCOTUS is far more likely to take a "back door" approach to repeal of the 2nd by using the discretion afforded via Heller for the local/state regulation of firearms and firearms transactions. There would be little need to directly reverse Heller - instead, you just kick out the legs from underneath it and render it meaningless.
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