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It is possible that some NPCs scale to very high levels. J'zargo (the companion) is rumored to level up with you until 81 at least and I see no reason why this couldn't be the case with other NPCs too. As always though no accurate answers from me :).
Shooters are nothing like this game in regards to CPU and GPU load. As for this tweak, the only way to find out is to try it. For the record, Skyrim runs just fine on 2GB of RAM. It is only when you add large texture mods that you need to have more memory space allocated. Yep, I use a ton of texture mods, the flora overhaul, a load of town expansion mods, and ENB.