Let me start off by saying I'm in no way an expert on the legal ramifications of the DCMA, I am just stating my opinions on what I've read.
I would hope that at least, we get some way of playing CoX in single player mode. I think that if this happened, it would fit into the "abandoned software" category. However, there is a lot of content in game that would have to be modified or that content would be worthless (TF/SF, Wentworths/Black Market, etc.). Also, SG/VGs also having to be modified so you could get multiple characters into them (maybe just a local editor so you could place different characters into the SG/VG). So it's a big can of worms modifying the software so you could play it all on one computer.
Now LAN mode is sort of a grey area from what I read. Yes, you are bypassing the authentication servers, but you are making it multi-player again.
Now, if you change it so you create your own servers, with everything functional, that would be in direct violation of the "DCMA".
Finally, if you say "Pay me, and I will do this for you", again you are in violation even if you just make it just single player.
With all that being said, I would be willing to "donate" money (they can't charge for their work, they'd have to release it "free" with a donate button) to someone who made single player mode work, even with a lot of functionality gone.