This is the brilliance of natural selection. If it were any less robust life would probably have already gone extinct. It's "easy" to devastate the ecosystem and wipe out say 90% of biodiversity, but that remaining 10% becomes increasingly difficult to root out, as you're increasingly dealing with the hardened survivors. The massive bust leaves open ample under exploited niches, which then spurs rapid disruptive selection, and then subsequent sympatric speciation. Long after humans are gone something will probably be thriving feasting on our garbage.