I'd imagine the story to be th biggest barrier, just ahead of the engine and gameplay (which would need to be updated to fit modern standards).
With HL games, technically the experience is completely unbroken since the first game. They leave you on this giant cliffhanger with Gordon passing out and a set goal, and I can see how they would have trouble finding a way to pull it all together, especially when there's so many loose threads clinging from all the past installments.
I mean, who is the G-Man? What happened to Adrian Shepherd? Where does Aperture fit in all this? Will we ever see Chell or Glados in the series? What's going to happen to the resistance now? What's up with the Borealis? Is Barney alive?
So many questions, and they can't just keep on making more questions or they end up with a mess of a story that would rival Lost towards the latter seasons.
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