AFAIK, BTC address never expires and in Binance you can only have one deposit address for bitcoin so if they sre changing addresses of everyone for some reasons then its due to development of their platform or something like that
Bitcoin wallets are not affected by this recent update. Only ethereum addresses and few other coins are affected. And you are right, addresses do not expire.
What happens if coins is sent to the wrong address, to the expired one I mean? Is Binance going to ensure a failsafe in case of such mishap?
You will receive the coins but it will not be credited to your account till you click on the
One Click Arrival button. However, no one knows when this feature will be removed and you will not be able to credit coins to your account, even manually.