Innovations of the post-BB larger screen size

Sir,
The Crytek 3 Engine and current Source Engine are both 3D Gaming Engines.
As maplestory is a 2D game, implementing/replacing the current engine with one of these engines would be goddamn near impossible. (Or just flat out impossible)

Plus there is the issue with licensing and whatnot. Do not get me wrong, I have seen the Unreal Engine play a 2D game, but this 2D game was more of a pinball-esque game and was really 3D with a fixed camera.

If I recall one the the GM's stated that MS runs on a 3D Graphics engine. What I think they should do if they ever make a sequel or a reboot is, make the skills and maps 3D but keep 2d sprites, all side scrolling.