In my previous post, I mentioned some of the things that Wizards of the Coast could do in order to improve their relationship to the fans who will make or break the game.
The other thing that has nothing to do with game mechanics, is stop acting like Orcus, Asmodeus, the Slime Lord and the other numerous demons and devil higher powers have been dipped in gold and that we mere mortals are lucky to get one set of such stats per monster manual.
2nd edition pretty much skipped out on these big bads entirely. There were a few reasons why but in the end, it was just plain stupid. Mind you, in the end, it didn't really matter because the differences between 2nd and 1st edition were so small that if you couldn't run a game that incorporated both elements into your own campaign that you had more serious problems.
3rd edition though? Thank god for Necromancer Games and Green Ronin. They provided a ton of game stats that lasted a good long while even as WoTC hoarded the game stats for Orcus and other bad boys for the Book of Vile Darkness that was 3.0 and immediately had to be updated in books later on down the road.
4th edition was even worse in this regard as they decided one demon lord was enough and hey, a Legend and Lore book where you could throw down with Thor or other popular characters? I mean, we all know that there was a Thor movie that mad a ton of cash recently right and that the character is going to be in the Avengers movie? Apparently that was too much for 4th edition.
5th edition, right out of the gate, should look at the 1st edition Monster Manual and go, "If it was good enough for Gary..." and while perhaps not everything was, the demons and devil section of that old book wasn't afraid to tell you how many hit points those demon lords and devil princes had in the first core monster book.
WoTC has some interesting decesions ahead of them. If they are unable to put out quality material that can expand their reach past the core books and decide that the only way people are going to be interested in a Monster Manual 2 is if they piece meal out the game system, they are DOA in uniting all gamers.