Same here. DJing is all about working hardware and stability.
Anything can crash or break during a set, this is why the old technics became popular – it was just working. Any time.
There are already some nice wireless toys like the Numark Orbit, but i would never use the main audio source over internet or a wireless device. Numark Orbit is only a controller, no audio interface – even if it lose connection or shut down, you will still have music playing and a working software (mouse/touchpad & keyboard shortcuts are working, maybe a second controller).
Try to avoid additional stuff that can break, keep it easy.
I know many DJs who are still using Traktor Pro 1.2.x just because its working with their hardware and its stable.
And have a backup any time – last gig my traktor software got a problem (freeze, but the track was running) – so i got enough time to switch my controller to analog input and use it, while restarting the software). That saved my butt – nobody noticed a break, just me going crazy in the booth.
.
