Because we have detailed records of what got sent, where it landed or crashed, and where it crawled or flew, I don't see any big problem or cost of compiling a database of that info. Probably some "citizen scientist" can do that already. Or, if not, could volunteer to contact the various space agencies for the exact coordinates.
But, I don't see any purpose in some "space archeologist" tracking down the shards of parachutes, nose cones, etc. "for posterity". Much less preserving the litter wherever it is dispersed to.
This is nothing like what archeologists do here on Earth, where they try to figure out what went on in the past by looking at discovered pieces of pottery, tablets, tools, etc., for which we have no records to read. We know what is on Mars, why it was sent there and mostly where it ended up. We don't need to preserve it to "understand history".
Maybe someday, specific pieces like the first helicopter will be returned to Earth for display in a museum. But, frankly, why bother when we can simply build a replica or even a fully functional duplicate for far less cost than returning the one that we sent to Mars?
And, Mars is not the kind of place that can support batches of tourists being led around by guides to show them the junk there in situ.
So, this just looks like a ploy forgetting some funding. Let the people who actually think it is important do it at their expense.
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