It was already possible, but it requires 1) an MCP server that terminates connections, and/or 2) for both the client and the servers to gracefully handle terminations and reconnections without bothering users with it.

As for the "just use a CLI" crowd, stateless MCP servers should satisfy us too - it means providing an mcp CLI tool that provides all the benefits of a CLI with access to all the API's exposed over MCP has just become easier.