Reply to Moving into the present with S4 & X1..?

I have until recently been using 2xCDJ400s and a 4 channel Behringer DJX700 and Korg Kaoss Pad KP3. I started on the CDJs for their usb function instead of using CD's. After years of not utilizing it as a midi controller, I started using Traktor Pro ( I haven't even looked at other software) I decided to buy a X1 and the free Pro 2 upgrade, now i seem to hardly even touch my CDJ's. I have decided to buy a S4 so I can use the external mixer rather than buying an Audio 2, 6 etc. I have decided to sell my KP3. I feel buying the S4 (which is a definite) it will make my CDJ's and mixer redundant. Is this the case that I will vertually have 2 full set ups or am I best to intergrate the CDJ's whit the S4 & X1.
Your opinions please
Cheers,
DuBby