I can't imagine that they will time-bomb it, but it will continue to work. But there will be no updates of any sort, so by time you may face problems when trying to use new features.
I guess that the SQL support in VS code will continue to evolve over the year until ADS retires. If there are any specific features you think are lacking, you could file and issue at the Github site for the mssql extension: https://github.com/microsoft/vscode-mssql.
And, of course, if you have a Windows PC, there is also SQL Server Management Studio.