Set a calendar date for products to go back into stock.
To be able to select a back in stock date on a mini calendar for a product - or variable on a product. When the date arrives, the product would automatically go back into stock. There is an add on that does this for oscommerce - but not for woocommerce.
This is a good idea. There is actually already a calendar function for the sale price - they just need to apply this same thing to the stock of products.