Agree. I'm holding off on disc because I have enough rim brake wheels to last me until I die.
One of the guys on our team decided it was time for a new road racing bike. Wanted the Tarmac, but non-disc. This is nearly impossible. He's in the same boat as you.
Fortunately, he doesn't ride one of the common sizes. So, we were able to get a rim brake S-Works Tarmac frameset and do a custom build.