Ghost hit it on the head. It's about flex. Racers search the race room for their preferred flex pattern. With a wider variety of calibrated arms, anyone can tailor a ski to their preferred flex pattern with the mutix concept. Like customizing boot fit/flex to preference, the arms are similar for a ski. Width and side cut don't change (that would be some feat, eh?) but a stiffer flex does require more input to get the same on-snow arc out of a ski, and therefore can influence the arc produced by de-cambering.
I haven't skied them (yet), but did a race clinic with Doug Daniels at Mt. Snow last year just after Rossi comp’ed him a pair. He said they skied "OK", but they weren't a high-energy race ski. They were a little squirrelly at speed in the GS gates, but he switched to the longer arms for the timed event and won his age group. So they couldn’t have been all that bad.
I think the price point is too high, and the flex options too limited, for the market. Besides, race-inspired skis aren’t cool – everyone wants to be an “off-pister”. Need the option for more than just “race” skis. This isn’t one-ski Holy Grail technology, but it could be a way to dial in a ski the way you really like it.