The 35mm scan we've seen so far is very beat up in some parts (reel changes in particular), and pretty dirty overall. It will take a lot of effort to clean up even the best-looking parts to blend convincingly, so I'd imagine Blu-ray footage will likely still be used except for parts that need despecializing.
But yeah, long term, that's what Harmy meant when he said a good 35mm preservation might leave him out of a job.