From a geological perspective, several types of rock will last more than long enough. Maybe you're thinking too long-term, heh. During the last 2.6M years - an

From a geological perspective, several types of rock will last more than long enough. Maybe you're thinking too long-term, heh. During the last 2.6M years - and man's been around -at least- that long - there've been a dozen or two ice-ages. Between them were interglacials, some of which lasted 2 or 3 times longer than our 10,000-year holocene. More than enough time and resources for an earlier (even wiser or saner) humanity. Or three.