Honestly, I'm just fine with WOTC leaving the digital D&D up to Fantasy Grounds and Roll 20. It takes some of the work off their plate so they could focus on new content rather than re-inventing the wheel.
I was looking at eBay last night at a lot of the old campaign books and wondering myself how hard it might be to make one from AD&D work with 5E. This is an excellent idea, IMO.
So tempting, but I am just starting out with RPGs and trying to be social in public instead of at a computer XD
But would be useful if I go back into shut-in mode.....very tempting! Basic lifetime for less than $30...