Ok, admittedly, not a lot of progress can be made on this right now seeing as it isn’t officially released (even though it was announced that they would, ages ago… that’s Valve Time for you).
But probably worth gauging some interest now, just in case.
Source engine has actually a long history now, first being used in Counter-Strike: Source (eventually GO) and Half-Life 2… nearly 14 years ago… suddenly feel old
Actually it probably goes back further than that… nearly 20 years ago… as some of the toolset and concepts behind the engine of course came from the Half-Life “GoldSrc” engine.
I guess you could even go as far back as the original Quake engine which is basically what the GoldSrc engine was based upon, but I think 20 years is already enough to make me feel my age, at this point.
Anyway, long story short, if you look at the longevity of these engines, look at how they’ve powered some of the best selling, most popular video games of all time, and also kept a still very popular modding ecosystem going for decades, then it adds up to something that should be seriously considered for building a course around in the future. You know, if it ever gets released, that is. Y’know… like Half-Life 3 will be one day