@Sereg: Funny you should mention that after me re-posting The Legend of the Three Kings yesterday... one of the big things that I put forward in the legend is that the need to keep things moving is due to the fact that when the three races were first born they went to war to determine which of them was superior. In this days their magic was much stronger, so they basically destroyed the world, and the only way to keep the planet from crumbling to dust was to manualoly control every process.
Of course, considering that was
millions of years ago they've jump-started it enough that everything functions mostly as normal now. Equestrian territory is a bit 'lazy', buyt if they left it be it would start to function naturally again, as do most places outside of Equestria. Ponies only need intervene where normal functions are non-habitable, such as Acmippo(The pegasi living there constantly fend off the storms and winter winds that would freeze their kingdom solid at the high altitudes and longitudes of the countr) and El'Bia(The EP's use their magic to make plants grow in the barren desert).
There are, however, still a lot of magical hotspots where things are either completely fucked(Such as a mile-diameter pillar of water shooting into the sky in the middle of the ocean), or just straight up dead.
T Yhe planet is well on it's way to rebuilding, but it's still damn broken.