Yes, most Pioneer gear from 5-10 years ago is still in use today. The DJM-2000 is a tank of a mixer and should last a very long time. NOW, that said, not knowing the treatment of the gear and what it has been through becomes the variable that I can't speak to or guarantee.
I used a pair of CDJ-1000 MK2 and a DJM-600K from 2004 through 2010 for every gig I did, no issues no problems and all gigs were as a mobile DJ. I would say research the gear and it's use if possible, but I am very confident in this being a great choice of gear........