I agree with the OP's request, not the tone. I'm one who prefers Horizons "as-is" for a variety of reasons, and if someday Odyssey becomes something I'm interested in, I'll just buy Odyssey - no need to give me a lite version for free, I'm willing to pay for it if I want it.
But I also understand that it may require more work to maintain Horizons as an entirely separate program from Odyssey, so while I'm hoping for the best (leaving Horizons as-is), I'm preparing for the worst (replacing Horizons with Odyssey Lite). This will likely mean the end of Elite in VR for me, since my computer can just run Horizons in VR, with no room for any performance loss.
The one hope that I have is that if Frontier has to maintain Horizons as-is for console, then doing the same for PC shouldn't be that hard. I've read the arguments why this is not as trivial as it sounds, and those arguments have merit, but as long as consoles share the same BGS as PC, Frontier is going to have to work around things like engineers behaving one way in Odyssey and another way in old Horizons, so why not do that on PC as well? Of course this means that Horizons players will never be able to instance with Odyssey players, which is a shame, but for me personally, it's the lesser of two evils.