I think he means to boost the SPL in the upper bass and mids range. A LOT of "flagship" speakers with ribbons or electrostatic panels include a line array for this.
Witness, the Martin Logan Statement e2:

You can easily tell which part is the ESL panel (the clear panels). The box to the side of the clear panel is actually a line array of 7" drivers (I think they have 8 per side). This gives the Statements all the wonderful air and transparency of big electrostatics, but all the upper-bass and midrange punch anyone could ever want. (Bass is provided by 2 separate subwoofer modules which have 8x12" drivers each--you can see on ein the rear right of this pic...) I looked and looked on the web, but couldn't find a SINGLE pic of the Statements with the grill cloths off of their line array. Oh well...
I've heard the Statements, and, YES, they ARE all that and a bag of chips. After hearing these speakers, EVERY other speaker is just a sad approximation of what a speaker can be. Of course, they retailed new for $79,999, and have a total weight (4 modules, plus crossovers) of 1800lbs, and you need a room the size of a small barn to let them really sound proper...
So anyway, I agree that a line array would only make your new Amazing Mk IV's sound better, and would DEFINITELY give them that mid-bass authority that a lot of ribbon speakers lack, but you've got to then worry about all sorts of OTHER design issues" phase linearity with the ribbons, an additional crossover channel, and a MASSIVE jump in current demand from your amps. Most of the ML Statements I've seen on line seem to be Tri-Amped. That would mean you'd need to go out and buy a whole stack of those Odyssey beasts that you use, but it sure would look cool with a bank of SIX Silver 7t's lined up on the floor behind them...
Something sort of like this:

I added a line array of 5x5" drivers, and a second woofer.
Ahhh, a boy can dream, can't he?