When is DC's The New 52 going to revert back to the original universe
when the sales start to slip.
If the sales start to slip, of course the company will do something else new again. There is no virtue to returning to something that wasn't working for them commercially to begin with.
The interesting thing about the relaunch being done as it was is that if they want to bring back any particular character or element that was really significant - say, getting Lois and Clark married - they can just go ahead and do it. There's no need to "return" to any oldDC status quo.
No sign of Superman's Speedo on the horizon, of course.