will minecraft die?

It won't in my opinion.
As long as there's something new being added to the game it won't die.
Unlike games like Counter-Strike: Global Offensive where it's just the same thing over and over again, just reskinned, or new maps that run off the same thing of Long, Short and Mid (or something similar to 3 or 4 lanes).
Minecraft has a ton of things to do already and tons of people play it and join every day.
Sure there's people leaving it, and a lot of them are big YouTubers, but just seeing a few YouTubers leave the Minecraft scene, doesn't mean that the game is dying out.

The acquisition of Minecraft by Microsoft was great IMO, they've really put a lot of work into improving the game and I'm sure that they'll continue to do so.
Mojang and Notch wouldn't have sold on the game if they knew Microsoft and the game team couldn't take it to better places.