Not sure what kind of conversion docs you're talking about.
If you mean docs on how to convert a 1E character to 5E, I don't see any point. Pick a level and create a comparable character. They're going to be different, but you can shoot for core features. Any doc for this would look like the 2E => 3E guide, which was ~15 pages of "take your best guess".
For monsters, magic items, etc. I don't think a guide can be written. Each one is a special snowflake; most of the stuff that can be generalized already has been. I just want a "Magic Item Compendium" and a "Spell Compendium" and a "Monster Manual 2". A lot of that could start as an Unearthed Arcana column, with the potential for the combined "Compendium" format, later.
Finally, for settings, I'd really prefer an updated hard-cover for the settings I care about (mainly Eberron, though I'd bite on Dark Sun, Ravenloft, and Birthright). It would contain all the info I needed to run a 5E version of the game -- basically a 5E version of the 3E FRCS, ECS, etc. An acceptable, and more realistic, alternative would be to convert the crunchy bits, give it a decent layout, and put it up on DnD Classics, like the PoA companion was.
In any matter, I guess I come down on either wanting to be given a fish or not being hungry. Actually, I think we've been given enough information in the core rules that we should either know or be able to figure out how to fish. It's just a matter of whether we have the time/inclination to do so. Twenty years ago, I'd have jumped at the task; today, I don't have time.