Actually, it's not so rare in clubs. Wait, I take that back... TURNTABLES (not vinyl) is not so rare. Most clubs still have a turntable setup but now they usually have them with Serato, and they just have DJ's bring in their own laptop and their own needles, sometimes their own control vinyls. I would say a good 95% of the club DJ's I know still use turntables, or a combo of both CD and TT.
That's also not totally accurate for the club scene... if you are mainly a hip-hop DJ, there are a lot of people that will get on you for not using turntables. It's a big part of the culture, as much as breakdancing and tagging is. I embrace technology, but there is no way I would do some of the events I used to do with my Denon MC6000. There is no way I would open for Nas or Jay-Z with anything but turntables. That's just how it is as a hip-hop DJ.
I think that is going to be the slowest part of the DJ industry to evolve. They barely recognize CD Turntables right now as it is, and the controller market is pretty much going to go bananas in the next few years, so I wonder how it's going to be then? Like I said before, Tec's will never get out of style, but I think there will always be that section of DJing that requires turntables.
All very possible. I am a mobile DJ and know mostly mobile DJs. I am a wedding DJ and MC, not a hip-hop DJ. The few club DJs i know use computers, but I don't know a lot...maybe they are the 5%. Can't even say I know what a "hip-hop" DJ even is. I assume it's a club DJ that plays lots of hip hop...or the dude that keeps one ear phone mic to his ear while scratching. I play hip hop when the situation calls for it. Some events more than others.
Regardless, DJing in a club is MUCH MUCH different that what I do. Perhaps the OP should be a club DJ if he's not already. If it's true that 95% of club DJs are still using vinyl, then he will have plenty of company and will need to find another way to stand out.