I have never, ever given a mare a "year off".
They are horses, animals, they actually prefer to be in foal (if they are used to it) than they would standing around doing nothing.
Now, if you were going to harness train her, or show her, fine.
If my mares take a year off, that is absolutely fine, no problem at all.
But, basically, so long as they are healthy, there is no need to even think of it.
If you decide to take a mare out of the natural cycle you must be prepared for her not getting back in foal, or having problems doing so, anyway.
And you have also to be prepared for her not thanking you for it, too!!
If none of your mares were put in foal, and so no foals born that year, it would probably be OK, but an empty mare can be a lonely thing.
They do not think things through as we do, sometimes it is best not to anthropomorphise too much.