The average computer programmer salary in DFW area is considerably less than $120K.
The conversation is interesting, however, it seems like there are options that are not being considered.
Lets just say for example that HT has a something in his will that would release the code should he be unable to continue.
There are many skilled devs in the open source world that wouldn't cost 120k per year. You would also have the added benefit of having multiple sets of eyeballs looking at the the code.
I agree with your assessment about other games integrating the technology developed for AH3. I for one would like to see the game itself stay around in some from, which I'm not sure would happen if it was bought by one of these other games.
If it was me and I cared about the legacy of the game I would open source the coad so that it could continue on even after I was gone. Releasing the coad would allow other games like DCS and IL2 to use the server part to integrate with their offerings while preserving the latest form of the original game.
An example of something like this is Linux Air Combat developed by bbosen.
https://sourceforge.net/projects/linuxaircombat/Some of you may recall that name. It came from open source GL-117.
https://libregamewiki.org/GL-117If I was a open source coader I would add an interface that would allow the easy addition of new ground vehicles, planes and other objects, kinda like the skins do currently.
I think something like this might keep the game alive in some form for a long time. People could run their own custom servers like combatbox (which I still see at max capacity weekly)
Just some ideas to kick around.