Some of the upcaming gachas do continue until early april, so it's at least not shutting down on april 1st. The first news post the game has is from the 14th though, so that might be the shutdown date, if it shuts down.
The new gacha, where you get shitloads of upgrade materials, has me a bit concerned though. It feels like a last ditch effort to let you upgrade your characters, although i really don't see why they're giving you blooming materials too. It's not like you can use them on anything.