Full Idea
The Second Law of Thermodynamics says it is overwhelmingly probable that entropy will increase. This leaves the door open for occasional isolated instances of decrease. But the thermodynamic arrow makes the increase a necessity.
Gist of Idea
If time is thermodynamic then entropy is necessary - but the theory says it is probable
Source
Robin Le Poidevin (Travels in Four Dimensions [2003], 12 'Three')
Book Reference
Le Poidevin,Robin: 'Travels in Four Dimensions' [OUP 2003], p.213
A Reaction
Le Poidevin sees this as a clincher against the thermodynamic explanation of the arrow. I'm now sure how the Second Law can even be stated without explicit or implicit reference to time.