Do you guys ever think maybe when source engine 2 comes out there will be another garrysmod or nah? I mean g-mod has been very succesful as a game....and a lot of people still play.
Already developing garrys mod 2, but not officially the game developers, but just players who helped to develop and remove bugs, you can find the theme on the official website of the developers, even the discord is where they upload screenshots and videos.
So the Newest version of Garry's Mod will be S&box. It will not use source engine. Instead, it will use Unreal Engine 4. Meaning that there will be no Lua. All C++. So good luck!