i suppose they will announce ahead before shutting down.
i rely my trading on binance so it should affect me for the most part but there are lots of exchanges anyway. one thing that is important in binance for users including me is the p2p which we use to exchange coins for local currency. thats really the most helpful for us.

i find it hard to shut down binance.com though but probably the local binance which if the government shutdown their operation. this is very possible if they can't comply with the regulations in one country. binance though is very compliant.