With the difficultly leveling out... there is a potential.
There isn't. Even if there are no new miners, there will still be newer, better hardware which will push the difficulty up.
As of now there is no way of telling if that new hardware will be released tomorrow, a month, 3 years from now.
First time in 22 months the difficulty went negative.
Althought it would seem it might be soon as people are claming .2Ghs/Watt chips are hitting the market.