I was thinking more at a fundamental level, I pointed out the economic changes.

For example many people think, I included, that the Bitcoin block-size should never be increased beyond 1MB.

For me stake weighted voting allocating a large part of the inflation should forever remain. Although this is being strongly challenged by the SPS.

The inflation schedule should always remain.

9 8 7 6 5 4 3 2 1 1 1 1 1 1 1% IIRC

Account balances should never be modified, obviously.