Don't jump to conclusions about the parachute being rapidly buried by dust.

As with everything else to do with the thin Martian atmosphere, it's dust loading is limited by the ability of such a thin column to hold up even very fine material.

A couple of moderate dust storms blew past the Viking landers and merely dimmed the sky - it did not go dark like in a dust/sand storm on Earth. After the dust cleared, there was a very thin film of dust on the landers - not enough to even begin to cover the bright paintwork.

The Pathfinder landing site was analysed for the rate of dust build-up and the answer was of the order of millimetres in a billion years - i.e. negligible.

So that parachute, if it deployed, and if it didn't candle or bunch up somehow is probably sitting wrapped round a rock somewhere near where it was aimed, waiting to be found one day, perhaps even by Bill Hartmann's legendary explorer.

It may be interesting when we finally get a radar mission to Mars to see if we can identify some unusually bright point reflectors at various strategic locations on Mars - The intact or wrecked metal bodies of the numerous landers.