That seems like it would be a feature, lots of free energy and no more earthquakes killing people, destroying infrastructure (which must cause massive amounts of pollution), etc.
Or all the continental plates have shattered into a billion pieces and molten rock is bubbling up through the innumerable fractures.
Moot point-- it's not possible currently.
However, think of the sheer amount of potential energy cause by plate tectonics... we're talking about continents... moving.
I mean, if you want to be technical about it, it would definitely not be downhill from there because all the hills would be gone.