
There's undoubtedly development work to do, but I'd expect it to be relatively minimal compared to the heavy lifting of adapting current code to ARM. As for the database concern, I'm guessing that C1's databases use SQLite, which is cross-platform. While C1/Intel might not run as fast as a native ARM application, it "should" still run, just as not supporting Metal hasn't stopped C1 from running on current OSes. IF you believe them (remember: Cook also said the new Mac Pro would run Mojave, which released versions never did and apparently can't be forced to), then C1 probably doesn't have to even support ARM for several years. Apple said they'll support macOS/Intel for a number of years after the transition is complete. Assuming that estimate holds (a big IF at this point), Apple will support macOS/Intel releases for at least that long. Apple's already said it plans to rollout ARM Macs over 2 years. However, I don't think that's reason to panic at this point because: Their uptake on support of Metal is a big case in point. I tend to agree with 'photo by FA' in that I doubt C1 will support ARM or the associated universal binaries for a while after ARM Macs are released.
