I'm loving using my active speakers - so much more convenient. There's another aspect to consider - the fact that with amplifiers built in, you've always got sound if one of them should malfunction. In the past, if an amplifier died, then it was 'goodnight everyone and sorry about the silence!'
The speakers now are so efficient that even smaller speakers sound very good, but the thing I miss is the appearance. A system with big 18" bass bins, mid range cabinets, and huge horns on top for the treble just looked fantastic! Even if they did cripple the poor DJ getting them into places.
I think that's why lighting is so important these days - because the speaker system don't look as good, the lighting HAS too.
In my opinion, the best thing to happen for djs is the LED lighting effects. These things last forever, and look so good, compare to the gear we had 25 years ago when I started dj-ing. I used to spend a fortune buying new bulbs, and they were really expensive!
Regarding wireless equipment - microphones are great, I wouldn't use anything else for karaoke. The only other thing I'd like to see, for professional use is a wireless projector - that would be brilliant! I don't see the need for wireless speakers though.