Saying that, supplies of highland & Islay peat are dwindling - in a few hundred years they won't be using local peat to dry out the barley
I don't think there is any lack of peat in Scotland - I guess what there is a lack of is areas where people are happy to ruin the landscape to harvest peat.
e.g. The Flow Country of Caithness and Sutherland:
NB When I was as student I used to have a summer job in a maltings that made malt from barley that was used by a number of distilleries. Note that most maltings are actually fairly large industrial plants - not really the normal image people have of the Scots whisky industry although lots of higher end distilleries do make their own malt.