Can capitalism be saved? No, it can't, nor can we make capitalism save for that matter. The human nature simply does not permit that to happen under any circumstance, regardless of whether your definition of capitalism includes the softer, saner version which allows for some degree of central regulation or whether you insist of the hardcore, lunatic libertarian version, which is basically another way of describing an anarchy.
As soon as any land and any means of production become someone’s private property, the tumble down the rabbit hole begins; an upper class is born which will continuously keep using their accumulated wealth to press for more wealth and power, and somewhere along this path towards absolute totalitarianism the system will usually destroy itself (if it is not destroyed from outside), be it eco disasters, upper class power struggles, rebellions or a combination of all these and more.