Earlier quoted context omitted.
I thought about this recently - probably Valve is reluctant to because people are still licensing both the GoldSource and Source engines (I think the last GoldSource engine license was in 2020 but the game hasn't even been announced; I think four Source engine games are due this year). If EA released the Nightfire engine code (very advanced GoldSource engine fork) that would be great though! But it's sad that John Ca…
This might be an argument if those engine licenses were more than a rounding error in Valve's profits. I seriously doubt that that's the case.
That said, I'd be a little surprised if any more engine licenses to get sold so maybe give it a couple of years.