Related to this: What research is being done on interfaces for VJing at the moment? Most examples I see are multitouch á la Minority Report and that's about it. Most multi touch projects I've seen has a lag which makes it pretty useless for live performance. But as the involved technology speeds up, I guess that will be solved sometime in the future. I'm however not so sure that multitouch interfaces are the best method. What other kind of interfaces are people experementing with?
And regarding DJs/VJs/Live acts merging: There are people good at music, there are people good at VJ:ing and there are people that has talent for both. Sure, As Vidder says, there will be consumer products that lets you do all of it and as more technologies gets available to the public, we will see more experimentation from all fields. I'm just not looking forward to seeing/hearing it so much. But of course, in that chaos a few new geniuses will be born. But I can't stop thinking it's like giving a kid a toy trumpet - it's going to sound terrible.