Agreeing with you, sir.
I'm pondering on just how hard it would be to tile the entire land of Hyrule as a single map, similar to how it was done in ALttP. The only area that was separate was the Master Sword area, I believe. Someone correct me if I'm wrong.
I believe it can be done, and I'm thinking about taking it on myself. Could be a lot of fun. Really, most of the existing ALttP tiles can be used. Though I believe when converting a 3d game to 2d, you need to make sacrifices and changes that better suit the 2d environment. For example, going by the map above, the Deku Tree would be facing east.. but the easiest way to go about that would be to have him facing south, obviously. So you'd have to make slight changes the layout of the area to suit that better. Also, pretty much all doors face south in ALttP. So I'd make adjustments so that all buildings are accessible from the south.
Hell, pretty much everything is North and South in ALttP. Ladders, stairs and whatnot.
Also note that I love how the areas on that map that you cannot see in the game are fogged out with clouds. I'd like to attempt that on my map with the Death Mountain clouds.