delericho
Legend
I think it's too hard...
Single corebook means probably max 500 pages,
500 page hardbacks are awful. Too big, too heavy, and too expensive. ~250 pages is much more reasonable.
IMO, if the game is so complex it won't fit in a single book of ~250 pages, it's too complex.
means high price for those who are only players, and way too small for the DM to have but a really small selection of stuff.
B/X manages with considerably less than that, despite the inefficiency of splitting the materials between the two sets. And, of course, there's the "Rules Cyclopedia".
Of course the DM can just buy more books (2x500 is the ~same as 3x320), but I think that if you need to squeeze monsters in with PC stuff (including spells!) and DM rules (including items!), then there is room for really too few monsters IMHO, to the point that if another book of monsters is very much needed within 2-3 months, then they can just go with the traditional 3 books arrangement.
Warhammer Fantasy Roleplay 2nd Ed manages with one book. As does Wheel of Time d20. And Star Wars Saga Edition, Mutants & Masterminds, Call of Cthulhu d20, Vampire: the Masquerade (2nd Ed and Revised)...
In moving from boxed sets and thin booklets to thick hardback books, D&D allowed itself to bloat up to a ridiculous degree. This was probably inevitable, as having all that space created a need to fill it. But it has led to what is a very simple game concept becoming an unholy mess of endless races, classes, powers, feats, themes, and other 'moving parts', probably to the point where it hampers player acquisition.
It's time D&D was put on a very restricted diet. IMO, of course.