I personally think that a SW renderer is a bit old fasioned.
Even if somebody has borked drivers or no HW accalleration. Then they should fix that instead of using the SW renderer.
I also think that especially the games that are being made with CS do not really have any advantege in having SW rendering. Atleast in our case we will most likely never use SW and will probably not support it.
Owh well ... thats my 2 €cents.