Gacha games are all about keeping your playerbase engaged. When you stop releasing information and events, and just let things autopilot for a week, people lose interest and move on. If the people running the game don't even care about that, well...that tells you all you need to know in-regards to how they value the game.
This game really is dead. This wouldn't be the first Nutaku game that closed down on me, but you think they'd at least have the courtesy to take five minutes out of their day to inform players of the closure. Not just give up on the game completely and let it stagnant.
Honestly, even IF they start releasing events again (but "if"), the damage is done. It's clear now that they don't have any passion at all for the game, and whatever playerbase it had has probably already moved onto other games (I don't blame them). I'm mostly just here to spend my gems on the Achilles banner since I've been waiting so long for it, but after that I'll probably just stop logging in as well. Unless they really make it evident that they're committed to the game, which I doubt.