Theres just no comparison between lugging along crates full of vinyl ( not that theres anything wrong with that, we had to do that for years ) and bringing a laptop or hard drive. For the mobile DJ its a no brainer.
Now as a 'tablist...I personally like the feel of vinyl better, and I believe the battle scene will stay old school, as far as that goes. I guess on the premise that more technological features takes away from the craft. I remember when the Samurai mixer came out, it was frowned upon by the real die hards.
So to sum it up, for mobile DJ's...digital is a no brainer, but I feel like 'tablists will always stay loyal to the vinyl.