Martin Amis: a philosophical conundrum

After reading this piece in my Sunday newspaper, an interesting question occurred to me which I wonder if readers could help me with.

What would Martin Amis have to do in order to lose his reputation as a "major" or "important" writer? Is there literally anything that he could write which might make literary editors and critics say "actually this man is really rather untalented"? Or has he achieved a sort of event horizon of writerliness, at which his seriousness and density have become so great that there can be no escape? I suspect the latter; surely a reputation that has survived "Koba the Dread", survived "Yellow Dog" and now survived this, must be indestructible. Long after the nuclear holocaust when we are all dead, the cockroaches that crawl through the ashes of Western civilisation will still take Martin Amis seriously, although none of them will know why.