Nic Carter has an idea toward that end, I'm not sure it he ever wrote it up. Basically tax unused utxos after some time to keep the mining rewards higher for longer. The complexity and push against tax probably makes this DOA, but interesting still.
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I wonder what the technical side of this would look like. How would the tax transactions even be signed? I don't see how you could tax any amount without essentially controlling the entire amount.
It would probably require a hard fork to allow a portion of funds to be moved based on address type and time. This spending would only be allowed to subsidize moving further through some unknown mechanism. It isn't a transaction tax, but more like the network taxing unused assets.
Requiring a percentage of old coins to be spent as fee will not work. People who are able to build a quantum computer can also spend a few more bucks to buy miners and mine the block containing the transaction themselves, without broadcasting it before.