It doesn't have to be the stadium being unavailable (although that is certainly the main reason for putting a licence on ice, like Swindon, Wolves, Peterborough etc), but Louis would have to show a "Force Majeure" as a reason for applying to put the licence on ice. That is an "unforeseeable, uncontrollable, event" which stops him running.
I doubt that just fancying a year off counts as "Force Majeure". I think any application to put the licence on ice for no real reason would be knocked back.