I agree that most of those people would be cool to hear from, but I also think you're discrediting the interesting things about some of last couple guests. There's certainly more depth and variation in their solving styles than "I do OLL/PLL". These days, I find it pretty interesting that there's a spectrum of the fast cubers, (this is just my observations) with Kevin at one end, being the epitome of "turn fast, 1case1alg4lyfe", and Mats at the other, having a lot of cool tricks and various algs for specific situations. Feliks probably lies somewhere in the middle, probably closer to Mats (and Alex Lau is off doing his own thing). It's an exciting time to be following speedcubing! It wasn't long ago that a lot of the fast people seemed to shun doing crazy tricks and stuff in your solves, but now that seems to be the common factor between Mats and Feliks.
A couple other people I'd love to hear from:
Robert Yau - Lots of algs, different fingertricks, different methods
Kris de Asis - Very slow turning
Cornelius? - I've never really taken a good look at his solving style to be honest, I'm not sure where he lies on the spectrum above, but I'd like to know

Any ex-3x3 WR holder - I'd like to hear their opinion on how the style of the fast people today is different than it was a couple years ago (because I think it's changed a lot).
Software wise, honestly, I'm not sure most of those people would be interesting to the general cubing public (I'm pretty sure the only software the majority of cubers even
use is a timer). I agree on Lucas though. Also Michael Gottlieb, I don't think anyone has contributed as much useful software as him.