Discount will be there may be a popular sentiment (otherwise it won't trade at a huge discount now), but how much is the question relative to their compensation? The current discount is too large, whichever way you want to capitalize that fee/incentives.
Out of 700 planes (both arrivals and departure) daily, ~100 of them are international. Its a small pie relative to the domestic, it collects more than 4 times average fee per passenger relative to the domestic customer. It will eventually grow both the customers and fee per customer over time as they are doubling the capacity in the terminal and runway.
They can bring in cash as they wish, plenty of ways to monetize these assets partially. They are in the process of splitting 'Fairchem'. They are considering taking the airport public when the valuation and opportunity makes sense. Although the profits are not streamlined up to the FIH, each business stands on their own cash profits and growing without needing support from FIH.
I would be surprised if they don't raise money from other investors and get paid somehow if they prefer that over time. Current possibilities seem difficult as both the discount in asset value vs assets in the holding company. It would be a stretch to think FIH will become an asset light fee generating entity with other people's capital in the near future.