Still, no matter what you say, it will be difficult to attract new people to Heroes of Might and Magic III. It's all about the graphics. Fans of the game will, of course, keep playing, but new players need 3D graphics. Even though you have great ideas and excellent castles, this will only slightly extend the game's lifespan (I think until the release of "Heroes 6," which simply must have sea creatures and castles).
And there are also many people whose computers can't handle super-high-end graphics (like mine).
Are you suggesting making a 3D version of Heroes of Might and Magic III? :D