I like this idea. Against the background of a Sith-run galaxy, where force users are immediately detected and sent off to be 'converted' to the Dark Side, an entirely non-force party would be necessary to offer any kind of resistance. The Force would still be important, in a sense it would be central, as you would have to deal with (i.e. kill) force-using Sith as part of your adventure. But it would be approaching it from a different angle, as well as making an original and challenging experience, to employ techniques such as those Atton mentions to defeat enemies substantially stronger than you could ever be.
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That's how it should be...the main ideea is the right to choose your own class...I'm not saying that you shouldn't be allowed to play a Jedi...I'm saying that you should be allowed to play different classes like spyes,assasins,techs,soldiers ,etc... :D