Well the time has come that the NDS Lite's production came to a full stop. According to the guys at GameStop, they received an e-mail about the news. Here is a screenshot:
Actually I already see this coming, since the DSi have been out. Maybe they are planning to manufacture lots of 3DS to replace it. Don't be sad though, only the Lite received the boot, DSi's and DSi XL's are still under production.