When we are upgrading the protocol, it is advisable to stop every transaction to prevent a bug or missing transaction that might happen when we are upgrading it.
That was why they were disabling it, prevention is better than cure.
Nothing to panic, not unless it goes beyond on a given time. The purpose is really to prevent an incident like this, and its normal for the upgrade. Wait for the announcement from the team if the upgrade was successful and dont create the panic.
The fork took place with success. The year 2020 will be the year of ethereum.
Well, the update was not on ETH but I also believe that the year 2020 will be good again to ETH.