I'm not sure if anything is being done about the rotation though I know things are being discussed.
It helps that switching it to The Last City won't lock anyone else out of the seal, as you're right that it's the only one the seal requires.
For your other question, once this season ends, the old seals and their triumphs will become legacy seals, it will not be possible to progress or claim any part of them.
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I don't have words to express how much I appreciate it being avaliable today. Thank you all, kindly.
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Aww, well, that's how life works. It would really help if the last city would be featured, but got no hard feelings if it's not possible. I understand that it may undermine how everyone farmed it at the time. Ty for you help!