Interesting discussion.
Personally, I'm on the original poster's side. I've done something similar with my speakers.
I think you could improve the performance of the X-Statik by upgrading the mids and tweeter and doing an appropriate crossover. If not, what is the point of spending more on drivers for any speaker?
Off the top of my head, Accuton or Seas Excel come to mind for the mids, and the Millenium for the tweeter.
The sticking point would seem to be in the bass. I'm firmly of the opinion, and Danny's success with the V series appear to bear this out, that the real strength of open baffle designs lies in the nether regions. The lower you can go as a dipole the better.
So I'd be sorely tempted to pop the back off the bass section and run it OB. Alas, obviously a pair of 6.5s won't be able to handle any real depth, but you might be able to get them down to 80hz or so and then cross to a pair of Danny's OB subs.
Acoustic Elegance make a suitable driver for this, and it looks like you could even add a third one below the others.
Naturally you'd have to do some dipole roll-off EQing, and EQ out the dipole peak and U-Frame resonance, but that isn't that hard to do these days if you go all active.
Whether the cost involved in all this compared to just buying a pair of V1s or V2s makes it good value is another question.
I suspect not at $250+ per driver x 6 per speaker plus subs, but I'm sure the result would sound much better than the stock X-Statik.