One thing I can see good out of this, is optimization. RTCW/ET somehow bloated the engine so much for some mysterious reasons causing it to be slow while not looking all that much better than Q3. Perhaps a drop-in D3D renderer would help?
And in case anyone is ever wondering, I lack lots of time so I probably won't be able to do a content project on the RTCWMP code (the mp game that isn't free), and if I did, the fans probably wouldn't like it or care anyway because of me dropping the ww2/nazi themes if I did one... though if I did one i'd have a more optimal technical direction without the infamous long load times.