Lots of even recent films that are released on 4K disc were up-scaled from 2K, whether from the original source or, more commonly, from a 2K digital intermediate. It doesn't mean they are the same thing as an upscaled mass market 1080p Blu-ray version, because the 2K source may be (and usually is) better in other ways than just the pixel count -- higher bit depth, HDR, higher bit rates, larger color gamut, etc.
AotC and RotS may have been a bit more limited because they were pioneering digital cinema, but I would still expect a well-made 4K transfer to look better than the current Blu-ray versions. I admit I don't truly understand all the nuances of this stuff, so I could be wrong, but I'd think it is too early to write them off until we actually see what they do with them.
SSB