[userbinator]

Are they still going to be the relevant useful standards 40-50 years from now? Will software/hardware for working with them still be readily available?

In 40-50 years from now we might not be creating new content in those formats, but the fact that they're official standards and there's plenty of source code around for decoding/encoding them means that they'll remain usable as long as general purpose computers continue to exist. (This is an actual real concern now, given the proliferation of DRM'd formats and proprietary restricted systems.)

Will the storage media be in as good condition as film would be?

Longevity of storage media is a slightly different and independent issue from file format, and one that could be applied to many other things; but as long as the original bits survive in some form or other, either through storage on long-term media or repeated copying, it won't vanish.