What is the guarantee your digital format will be readable after 100 years?
Provided there's still anyone who cares about the data after 100 years, I'd say the odds of it surviving completely intact are fairly good, especially if you use the space recovered through digital compression to store error-correcting codes. It's unlikely that we'd forget how to decode popular formats like MP3, FLAC or JPEG in such a short time, absent a global catastrophe of sufficient order to drive the entire human race back into the stone age.
I'll admit that analogue still images do have digital beat in one area, ease of access. For all its faults, at least film doesn't need a complicated decoder; just shine some light on it (or through it). Of course, that only works because you're not operating anywhere near the limits of your storage medium. How many analog images do you think you can fit in 15x11mm? My comparatively cheap 32GB micro-SD card can hold around 3,000 8MP raws (~10MB each), which is pushing the limits of consumer optics. With reasonable compression you could easily double that. At that scale I think you'd need a bit more than just a magnifying glass to see the individual images.
My response was really to this line, however:
But, we could do things with equally modern analog technology that would blow digital out of the water.
Any "modern analog technology" can be exploited for the storage of digital data, and thus benefits digital at least as much as analog. Analog is never going to "blow digital out of the water". It has its niche areas, like archival film for ease of access, and loses to digital everywhere else regardless of the recording technology.