This is true and is a problem. Discounts devalue your brand and Hyundai (and Nissan too) have a bad habit of doing this, as well as targeting lower credit score customers who default on loans or can't afford proper maintenance. Its sad but apparently its a business model that works for them.The one problem I see with the SC is if you don't like it and want to trade it in, you will be taking a bath. Hyundai's have improved significantly over the years, but their depreciation is scary. Probably because you can always get 10-12% off MSRP from the get go. Not in this environment, but in a normal market.
However if you want see truly epic depreciation take a look a BMW, Audi or Volvo. BMWs in particular are known for taking to the bottom of the ocean once driven off the lot. This is because nobody wants a used BMW or one that has no warranty coverage.