For SX usage only, no. If you want to use Atmosphere in the future without a jig and USB cable, there is an unreleased softmod for 4.1 that may come out sometime after its completion.
I have looked at some info about Atmosphere, but is it expected to have any substantial features over SX, or basically the same as SX but just free? And is Atmosphere supposed to have some benefit to being on 4.1 vs 5+ OFW?