Absolutely, I'm way too lazy to do the conversions myself, but without those conversions the old settings lose what made them unique in some ways. I've long been somewhat frustrated with the types of products and the format (type and page count) that WotC is putting out and the rate at which they are doing so. I understand why they are doing so as its proved successful and they are targeting a younger demographic. Still that doesn't mean they cant deviate from this from time to time.
Seeing as most of the previous editions books are available on DMs Guild so for the sake of argument here's how I see they could update the old most popular settings with all crunch and no fluff. People who want the fluff can get it elsewhere. For each setting they'd mostly need to update the following:
- Races
- Classes
- Setting unique rules
- Magic/Psionics: Spells, Magical Items, etc
- Monsters
Here what I consider the more popular settings and some either dont need much updating or have already gotten updates.
- Eberron - Updated in RftLW
- Exandria - New setting book
- Forgotten Realms - Updated in SCAG & adventures
- Greyhawk - Besides monsters I dont think much crunch is required and updated in GoS
- Ravenloft - Besides monsters I dont think much crunch is required and updated in CoS
This leaves the settings that need updating that have very specific mechanics that need to be included
- Dark Sun
- Dragonlance
- Planescape
- Spelljammer
I'd prefer hardback or softcover but I'd also support them doing pdfs with POD; they can even offer digital. Whether they address one setting at a time or say a book of races, then monsters for the four settings I think they have more options to consider and still make money than just do a complete update in one hardback per year.