"Lastly, what happens when people try to store long term storage things in a 0-value token or unspendable, and only need to access them once a year or less-- like grandma's home movie collection?" They still have to pay a fee to create the output in the first place so I don't think this will happen frivously. The first reaction I hear to the concept of 0-value outputs is "unbounded UTXO size!" but in reality it is bounded by economics which is an elastic bound. A few will slip through the net because irrational behaviour etc. But I doubt this will be of any consequence. Miners will get clever with storage applying heuristics to determine likelyhood of spend. We already know from 11 years of data that the older a UTXO is the less likely it is to be spent. 80% of outputs are spent within the next 1000 blocks. So once the likelihood of a UTXO getting spent in the next few blocks gets low enough (by whatever heuristic) you can shove it off to glacial storage. Eventually maybe even a tape drive. The few that do get spent will probably require a higher fee to cover the retrival, might take longer than usual.