I agree but more than than just the engine, all the original developers have probably moved onto other things. Any HL3 would be made by new people who have the "idea" what HL3 should be and not the spark that gave us Half-Life 2.
Even with the original team, the "Epistle Three" as originally outlined would have led to another massive cliff hanger and people would be clamoring for a HL4 that'd take another 15+ years.
I agree but more than than just the engine, all the original developers have probably moved onto other things. Any HL3 would be made by new people who have the "idea" what HL3 should be and not the spark that gave us Half-Life 2.
Even with the original team, the "Epistle Three" as originally outlined would have led to another massive cliff hanger and people would be clamoring for a HL4 that'd take another 15+ years.