Will minecraft get cheaper on black friday (27 nov)?

Paying over 20 euro for a game that's over 10 years old is just too much for me.

Do you think it will be cheaper to buy?

Nope, probably not. And you present it as if it has not received any updates for 10 years, which is definitely not the case. For such a game, 20 euro is nothing

"what is over 10 years old"

The game is updated twice a year, so the 20 euro safe is worth it