Think about all we could do with it. We could have halo reach-esque graphics, ragdoll physics. And so much more. I mean, I feel like they didn't actually lose it.

I don't know why people think having the source code is the holy grail. First you have to get someone to be willing to make those changes. You have to ensure everything you're doing doesn't end up breaking something else. Then you would have to do something about the ten different versions of Halo with different features to play one or two maps designed for them. Then you have to get a community willing to dance around your Google page to keep the program running long enough to design something that actually works. Keep in mind that there are people here who think the maps that Johnlex makes are good enough. Considering there are people who still aren't using 1.10 then I doubt you are getting a significant number of people to use the new and improved Halo.
Face it, you aren't getting anything.

This must be like the 20th topic about this.