Hm. Where did you see this? I can't understand why GfWL's shutdown would affect any games that you may have bought through MS that do not have Live-enabled features.
Well, when they kill Live completely I doubt they'll bother to let people redownload their games through the service since it'll be dead. I'm not talking about GFWL-enabled games. Just games bought through their client, GFWL-enabled or not.
IF they have a replacement or a plan to let folks continue downloading the games they bought, great! But always, always expect the worst.