On Mon, Nov 2, 2015 at 12:23 AM, Justus Ranvier via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:

Are there actually any OP_CAT scripts currently in the utxo set?

A locked transaction could pay to an OP_CAT script with the private key being lost.

Even if it is only in theory, it is still worth trying to prevent rule changes which permanently prevent outputs being spendable.

It's a lot easier to justify the position: "nobody has the right to
change the meaning of someone else's outputs", than it is to justify,
"some small group of people gets to decide what's standard and what
isn't, and if you choose to use the network in a valid but nonstandard
way, that group of people might choose to deny you access to your money
in the future"

If at least one year's notice was given, then people aren't going to lose their money, since they have notice.

Locked transactions could have a difference expectation than non-locked ones.

In other words, how close to the shores of "administrators of a virtual
currency" do Bitcoin developers want to sail?

Miners can collectively vote to disable specific UTXOs and change the acceptance rules.

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