> How many "DJs" today could even find t

A lot of them. The barriers to entry have been lowered, which also means there are way more DJs around. And some of them will start to expand their horizon.

I don't know, but I would not be surprised if the total amount of people who can mix without sync increased. Though the percentage of DJs who need sync is probably higher.

I started DJing with 'rona and now somestimes mix vinyl. And I also hosted open deck nights with CDJs where a lot of beginners did not use sync, unless they where only a few month into the game.

I don't think it's a negative.