Ah they address this in the forum! They're here to stay!

https://en-forum.guildwars2.com/topic/135175-discover-the-wonders-within-the-wizard’s-vault-in-guild-wars-2-secrets-of-the-obscure/

Q: Are there still daily login rewards? A: There will be one objective every day for logging in. This objective gives 5 astral acclaim (standard daily objectives give 10).

Guess this confirms the end of daily login rewards. If that's true mystic coins are going to be more expensive now

edit: addressed in the forum

Q: Are there still daily login rewards? A: There will be one objective every day for logging in. This objective gives 5 astral acclaim (standard daily objectives give 10).

https://en-forum.guildwars2.com/topic/135175-discover-the-wonders-within-the-wizard’s-vault-in-guild-wars-2-secrets-of-the-obscure/