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It won't stop working. Flashplayer has already been discontinued for web-browsers but the game is a .exe so it's all good. Newgrounds is also making the newgrounds player which allows you to watch / play flash games on their site. It's a little bit of a hassle to get working ATM but it does work. 

Here's the NG player.

https://www.newgrounds.com/flash/player

and Here's the thread to get it working 

https://sonucais.newgrounds.com/news/post/1137244

*pinching my nose* It seems you did not read all the post: my PC is already asking me all the time I start it if I want to uninstall Flashplaye. I fear that next time I will make a Windows Upgrade, it will be forcibly uninstalled. And then what?

Uh, like I said before it won't stop working. Your computer could not have flash installed at all and the .exe should still work. Windows is blocking flash content on websites. Even with the latest updates there is still work arounds to get the browser versions working like in the thread I posted.

*fiuuu* Thanks for the reply!